LEWIS R. MORGAN, Circuit Judge.
This matter on appeal involves a tax refund suit submitted to the district judge primarily on stipulated facts. The taxpayer alleged overpayment of taxes in the amount of $64,348.04 on income from the sale of corporate stock. The district judge below found that the corporations in question were collapsible corporations under Section 341 of the Internal Revenue Code and that the income from the sale of stock by a major stockholder should be treated as ordinary income. Despite plaintiff’s contentions that the income should have been treated as capital gain, we affirm the decision of the lower court.
Plaintiffs, Rolland L. King and his wife, Arlene P. King,1 brought this action in the federal district court seeking a refund for taxes they claim were overpaid for the years 1968, 1969 and 1970. Although taxes had been paid on the income in question at the capital gains rate, the Commissioner of Internal Revenue determined on audit that the income was not entitled to long-term capital gains treatment and issued a deficiency notice. Plaintiffs paid the deficiency, but simultaneously filed for a refund for overpayment.
The corporations in question included South Gate Water and Sewer Company, in which the taxpayer was a 50 percent stockholder; Greater Sarasota Sewer Company, [257]*257in which the taxpayer was a 50 percent stockholder; Gulf Gate Utilities, Inc., in which the taxpayer was a 45 percent stockholder; and King & Smith, Inc., in which the taxpayer was a 50 percent stockholder. A tax deficiency was also found by the Commissioner and paid by the taxpayer on income from the sale of property owned by a trust in which the taxpayer held a major beneficial interest.
The taxpayer King and his partner Smith formed King & Smith, Inc. in 1954 to develop a residential area east of Sarasota known as Forest Lakes. During its first year the corporation bought an option to purchase 1200 acres east of Sarasota at $2,000 per acre (hereinafter referred to as the Minute Maid option). King & Smith, Inc. ceased developing property by the end of 1955 because the individuals King and Smith had formed another corporation, South Gate Development Company, Inc. (hereinafter referred to as South Gate Development), in March of 1955 to continue the real estate development projects. By March of 1956 the land subject to the Minute Maid option held by King & Smith, Inc. had greatly increased in value primarily because of the success of the real estate developments of the corporation. At this time the taxpayer and his partner Smith sold all of their stock in King & Smith, Inc. to one D. H. Burk for approximately $1,673,000.00, with most of the purchase price payable over time as the remainder of the Minute Maid option was exercised. A part of the option had been exercised, with some of the land having been sold to South Gate Development. In 1955, because of a requirement that residential developments have a central water supply, King and Smith formed a utility corporation, South Gate Water & Sewer Company, Inc. (hereinafter referred to as South Gate Water), to supply water to the areas developed by South Gate Development. King and Smith each owned 50 percent of the stock in the utility corporation, which obtained a water franchise from the county and constructed a central water plant. South Gate Development constructed the water lines that were to carry water from the South Gate Water plant to the individual lots. After completion, these lines were conveyed by South Gate Development to South Gate Water without payment of consideration. In 1959 South Gate Development ceased developing property and in May of the same year, King and Smith sold all of their stock in South Gate Water to General Water Works Corp., an unrelated corporation engaged in the operation of several utility systems. Part of the purchase price was paid at closing and the remainder was paid over a period of time based upon the number of new customers connected to the system.
In 1958 Sarasota County instituted a requirement that all residential developments must be serviced by a central sewer system. King and Smith incorporated the Greater Sarasota Sewer Company to satisfy this requirement for their real estate developments, with each owning 50 percent of the stock in the corporation. The corporation obtained a sewer franchise from Sarasota County covering parts of the South Gate subdivision and other areas of Sarasota and built a plant and central disposal system. South Gate Development constructed several sewage collection systems, lift stations and other appurtenances in the area of its development within the Greater Sarasota Sewer Co. franchise. These systems were connected to the plant and central disposal system of Greater Sarasota Sewer Co. and after completion were conveyed to the sewer company without consideration. In 1965 King and Smith sold all of their stock in Greater Sarasota Sewer Co. to Florida Cities Water Company (hereinafter referred to as Florida Cities), a subsidiary of a company which operates several private utility systems. Part of the payment was made at closing and the remainder was scheduled to be paid semiannually based on the number of connections made to the system.
The taxpayer King, along with three other parties, formed in 1960 Gulf Gate Utilities, Inc. (hereinafter referred to as Gulf Gate Utilities) in which King was a 45 percent stockholder. The corporation obtained from Sarasota County both a water and sewer franchise covering an area of land south of the city known as the Gulf [258]*258Gate area. Gulf Gate Utilities built a central water and sewage plant to which sewage collection and water distribution lines built by real estate developers were connected. The R. L. King Company and the First Development Corporation, two corporations in which King was a 50 and 25 percent stockholder respectively, built sewage and water lines and connected these to the central plants of Gulf Gate Utilities. After completion these development companies conveyed the lines and appurtenances to Gulf Gate Utilities without charge. In December of 1965 the stockholders of Gulf Gate Utilities sold the stock in the corporation to Florida Cities, using a method of payment similar to the payment plan for the Greater Sarasota Sewer Co. stock.
In mid-December of 1965 both Greater Sarasota Sewer Co. and Gulf Gate Utilities filed consents with the Internal Revenue Service under section 341(f) of the Internal Revenue Code to have subsection 2 of that provision apply to the assets of the corporation. These consents, if effective, would prevent the gain from the sale of stock from being treated as ordinary income under section 341. In the years 1968,1969 and 1970, the taxpayer reported the income from the sale of stock of all three utility companies and King & Smith, Inc. as capital gain.
The taxpayer also claims overpayment of taxes on the sale of trust property in which the taxpayer owned a 45 percent beneficial interest. The taxpayer and three other parties created a trust that operated through the Sarasota Bank & Trust Company, Account No. 398. The trust acquired approximately 390 acres of land lying east of the then developing Gulf Gate Shopping Center. Between the years 1961 and 1962 the trust sold small quantities of the property to the Sarasota County School Board, the Hillsboro Enterprises, and the R. L. King Co. with a majority of the property being sold in January of 1963 to the First Development Corporation, in which taxpayer at that time was a 25 percent shareholder. The taxpayer reported the income from the sale of the trust property as capital gain. Having set out the factual background of the transactions involved in this case, we now turn to the legal issues before the court.
I.
A threshold issue crucial to the outcome of this appeal involves the question of burden of proof. In the Commissioner’s statutory notice of deficiency, the theory relied upon by the government was that the income from the sale of stock was constructive dividends to the taxpayer. The parties engaged in discovery on this theory, but three weeks before trial the government changed its theory of defense to a theory based on section 341. The taxpayer insisted that he should not bear the burden of proof regarding this new theory, and with an amended pretrial stipulation the taxpayer attempted to shift the burden of proof to the government. The stipulation indicated “[t]hat plaintiffs have the burden of proof on each issue except the utility stock issue.”2 When considered in light of the entire stipulation, however, this language is ambiguous. The full stipulation states that “[tjhere is no disagreement ... [t]hat plaintiffs have the burden of proof on each issue except the utility stock issue.” A possible interpretation of this stipulation, as urged by the government, is that the parties could not agree on who had the burden of proof on the utility stock issue. Although it is not clear to this court (nor apparently to the parties) what was intended by the stipulation, we need not make that determination. A court is not bound by the parties’ stipulations of law, particularly when those stipulations are erroneous. Swift & Co. v. Hocking Valley Ry. Co., 243 U.S. 281, 289, 37 S.Ct. 287, 289, 61 L.Ed. 722 (1917); Equitable Life Assur. Soc. of United States v. [259]*259MacGill, 551 F.2d 978, 983 (5th Cir. 1977), reh. denied 554 F.2d 1065 (5th Cir. 1977).
The district judge in his opinion found that the plaintiffs had the burden of proof on all issues regardless of the fact that the government had changed its theory of deficiency before trial. Although the Tax Court rules provide for a shift in the burden of proof in certain situations,3 and a few lower court decisions have applied a similar rule,4 several courts have held that the burden of proof does not shift to the government in a tax refund suit where the basic theory of the deficiency notice, i. e., ordinary income, and the amount of deficiency have not changed. See Spangler v. Commissioner, 278 F.2d 665 (4th Cir. 1960); Sidney v. Commissioner, 273 F.2d 928 (2d Cir. 1960); Arthur Sorin, 29 T.C. 959, aff’d. 271 F.2d 741 (2d Cir. 1959); Leland D. Payne, 30 T.C. 1044, aff’d. 268 F.2d 617 (5th Cir. 1959). Cf. W. H. Weaver, 25 T.C. 1067 (1956). This rule follows from the general rule that a tax refund suit is in the nature of an action for money had and received. See Roybark v. United States, 218 F.2d 164, 166 (9th Cir. 1954). The taxpayer has the burden of proving both that an overpayment of taxes was made and the amount of the overpayment. Lewis v. Reynolds, 284 U.S. 281, 52 S.Ct. 145, 76 L.Ed. 293 (1932); Bicknell v. United States, 422 F.2d 1055 (5th Cir. 1970).
Other courts have held that the burden remains on the taxpayer even when the Commissioner relied on an entirely different theory of deficiency at the time the assessment was made. Blansett v. United States, 283 F.2d 474 (8th Cir. 1960); Roybark v. United States, supra, 218 F.2d 164. In two separate appeals from Tax Court decisions, Cummings v. Commissioner, 410 F.2d 675 (5th Cir. 1969) and Bernstein v. Commissioner, 267 F.2d 879 (5th Cir. 1959), the Fifth Circuit similarly held that it was immaterial that a deficiency assessment was based on an improper theory. If the deficiency was appropriate under any theory, the assessment must be sustained. Therefore, the rule in the Fifth Circuit, at least in a tax refund suit in district court, is that a shift in theory by the government before trial does pot shift the burden of proof to the government. If a change in theory presents undue hardship to the taxpayer, it is within the discretion of the trial judge to continue the case. The parties, however, should not attempt to stipulate the burden of proof because, as a matter of law, the stipulation may be erroneous. In this case where the taxpayer attempted to stipulate the burden of proof, the court was not bound by the erroneous stipulation of law and the burden remained on the plaintiff.5
[260]*260II-
The principle substantive matter on appeal to this court concerns the application of the collapsible corporation provision of Section 341 of the Internal Revenue Code of 1954 6 to the sale of certain corporate stocks [262]*262by the taxpayer.7 The primary purpose behind the provisions of section 341 is to prevent the taxpayer from converting what would otherwise be ordinary income into capital gain by liquidating or selling the stock of a corporation before realization of substantial income. See generally B. Bittker & J. Eustice, Federal Income Taxation of Corporations and Shareholders 1112.04 (4th Ed. 1979); 3B J. Mertens, Law of Federal Income Taxation H 22.57 (Rev. Ed. 1980). The device utilized by the taxpayer for such purposes is referted to as a collapsible corporation,8 as described in section 341(b)(1) of the Code.
[263]*263The provisions of section 341(b)(1) define a collapsible corporation as “a corporation formed or availed of principally for the manufacture, construction, or production of property, [or] for the purchase of property which (in the hands of the corporation) is property described in paragraph (3), ... with a view to — (A) the sale or exchange of stock by its shareholders . .. before the realization by the corporation manufacturing, constructing, producing, or purchasing the property of a substantial part of the taxable income to be derived from such property, and (B) the realization by such shareholders of gain attributable to such property.” 26 U.S.C. § 341(b)(1).
Based on the foregoing definition, the taxpayer first argues that the utility corporations in question were formed principally for the operation of the utility franchises, not for the construction of property. Although this stated purpose is a reasonable one and the one most likely found in the corporations’ articles of incorporation, the court is not bound to accept the self-serving statements of the taxpayer as to intent. The purpose of a corporation is determined from the function of the corporation, not the underlying motives of the taxpayer. See Braunstein v. Commissioner, 374 U.S. 65, 83 S.Ct. 1663, 10 L.Ed.2d 757 (1963); Estate of Van Heusden v. Commissioner, 369 F.2d 119 (5th Cir. 1966). In a case such as this one where the only live testimony is that of the taxpayer, the court may look to the activities that took place and from those activities draw the inference that the corporation was formed for the construction of property. See Payne v. Commissioner, 268 F.2d 617, 621 (5th Cir. 1959). This judicial finding is subject to the clearly erroneous standard on review, and we find that in this case the determination was not clearly erroneous. Furthermore, the language of section 341 provides that a corporation availed of for the construction of property may also be deemed collapsible.9 Although the ultimate purpose of the utility corporations may have been to provide utility services, the corporations were at least availed of for the construction of the utility systems.
Taxpayer further suggests that the construction of the utility system was incidental to the purpose of the corporation and consumed only a brief period of time when considered in light of the entire length of the franchise grant.10 Apparently this claim is based on the word “principally” 11 as used in section 341(b)(1) and on the definition of collapsible corporation as explicated by Treasury Regulation section I. 341-5(b)(3). The regulation provides that the construction of property must be substantial in relation to the other activities of the corporation. First, the taxpayer misreads the provision as a restriction or qualification for finding a corporation collapsible. Subsection (a) of the regulation clearly [264]*264provides that the regulation only describes situations that will usually result in the finding that collapsibility is or is not appropriate. Furthermore, the specific provision cited by the taxpayer requires that “/ají the time of the manufacture, construction, production, or purchase . .. such activity was substantial in relation to the other activities of the corporation.” Treas.Reg. § 1.341-5(b)(3) (1955) (emphasis added). The regulation is not requiring substantial activity during the length of time the corporation may exist, i. e., the length of the franchise grant, but simply indicates that the activity must be substantial during the time of construction. During the time of the only actual construction by the utility corporations,12 the construction was the primary, if not only, activity of the corporation. During construction of the entire water and sewer systems, construction was still a significant enough activity of the corporation to constitute substantial activity. Therefore, the provisions of the Regulations do not affect the decision of the court below.
In addition to our technical examination under the regulation, we find in agreement with the lower court that the construction of the water and sewer systems was not incidental, but rather was crucial, to the operation of the utility franchises. Without the construction of the utilities’ water and sewer systems, the purposes of the utility corporations could not be accomplished. The district court did not err in finding that for the purposes of section 341 treatment, the corporations in question were formed, or at least availed of, principally for the construction of property.
Taxpayer further argues that the limited activity of the utility corporations toward the building of the utility systems was not sufficient to constitute “construction” by the corporation. The taxpayer suggests that the corporation primarily only purchased and installed equipment for the central plants, with the bulk of the construction on the utility systems’ water lines and sewer connections being done by private developers. The taxpayer’s argument, however, must fail. The courts have held that minimal acts constitute sufficient activity to satisfy the requirement of construction or production of property. See, e. g., Farber v. Commissioner, 312 F.2d 729 (2d Cir.), cert. denied 374 U.S. 828, 83 S.Ct. 1867, 10 L.Ed.2d 1051 (1963) (payments of fees for zoning permits and payment for utility connections held to be sufficient for a finding of collapsibility); Abbott v. Commissioner, 258 F.2d 537 (3d Cir. 1958) (contract for sale of land with agreement to install streets, sewers and utilities sufficient for a finding of collapsibility). Furthermore, the provision of section 341(b)(2)(A) permits a finding of collapsibility if the corporation “engaged in the manufacture, construction, or production of property to any extent.” (emphasis added). The construction activity of the corporations that consisted of constructing the central water and sewer plants of the utility systems was sufficient to satisfy the requirement of construction under section 341(b).
Recent cases have held that the development of intangible property is included in the concept of production or construction of property. Estate of C. A. Diecks, 65 T.C. 117 (1975) (development of cable vision system and related franchise in production of property within the meaning of § 341(b)(1)); Computer Sciences Corp., 63 T.C. 327 (1974) (development of a computer program for preparation of income tax return was production of property within the meaning of § 341(b)(1)). We hold in this case that in addition to the construction of the system, the development of the utility system franchises was production of intangible property within the meaning of § 341(b)(1).
The final definitional challenge by the taxpayer is based on the controversial phrase of section 341(b)(1) requiring that the construction of property, etc. occur “with a view to” the sale or exchange of [265]*265stock before the realization of substantial income along with the realization of gain by the taxpayer. The requisite view must exist prior to completion of the construction or production of property by the corporation. See Treas.Reg. § 1.341.2(a)(3); Payne v. Commissioner, supra, 268 F.2d 617. The taxpayer argues that the construction of property by the corporation, i. e., the construction of the central water and sewer plants, was completed prior to the time that the view to sell the stock existed.13 However, the finding made by the lower court and affirmed by this court is that the construction by the corporation was the construction of the entire water system. The completion dates of the central plants are not controlling because construction on substantial parts of the water system continued as additional water and sewer lines were constructed and connected to the main system.14 At least one court has held that the laying of lines, in that case cable lines, and the connecting of new customers was continuous activity that constituted construction.15 We agree with that reasoning, particularly in light of our opinion that the purpose of the utility corporations was construction of utility systems. It is irrelevant that private developers actually constructed the lines, connected them to the system, and then transferred them to the utility corporations. Such arrangements are common among real estate developers where utility systems are required. Nevertheless, the construction by the private developer is deemed construction by the utility corporation for purposes of section 341 because the utility corporation had as its purpose and function the construction of a utility system. This court will not permit a technical arrangement involving construction to defeat the finding of collapsibility. Where corporations were formed or availed of principally for the construction of utility systems, the construction of the systems continued during construction of the entire system whether carried out by the utility corporations or by private developers.16
Taxpayer has emphatically argued to this court that a utility corporation has never been held to be a collapsible corporation and could not be because of the positions previously argued. We have disposed of the technical arguments made under section 341(b)(1). Concerning taxpayer’s final appeal, the Code section in question sets no limitation on the kinds of corporations subject to its provisions. Although section 341 (formerly section 117(m)) was originally designed to control tax abuses in the movie and construction industries, any corporation which satisfies the definitional requirements may be collapsible. The Tax Court in Estate of C. A. Diecks, supra, 65 T.C. 117, held that a cable vision corporation operating under a franchise grant was collapsible. The factual similarity between the two kinds of corporations is obvious. Both the utility and the cable services involve franchises that provide from a centralized network services to individual homes. The cable and utility networks providing the service are operated and maintained by the corporations. Although many utility corporations may not satisfy the statutory requirements, the special circumstances of this case permit a finding that the corporations were collapsible. Therefore, despite taxpayer’s argument that a utility corporation has never been held to be collapsible, we find in agreement with the lower court that the corporations in question satisfied the basic statutory requirements and were indeed collapsible corporations.
III.
Having concluded that the corporations were collapsible under section [266]*266341(b), we must consider the taxpayer’s arguments concerning exceptions and limitations to the basic definitional requirements. Under section 341(d)(2) taxpayer cites the limitation requiring that at least 70 percent of the gain on the sale of stock must be attributable to the constructed property in order for the corporation to be deemed collapsible. The taxpayer argues that the gain was primarily attributable to the franchises, the customer lists and connecting lines. Although some of the gain was most likely attributable to these assets of the corporation, Treasury Regulation Section 1.341-4(c)(3) provides that gain may be “attributable to” the constructed property even when the gain is represented by appreciation in other property.17 In the present case little or no gain would have accrued without the construction of the central water system. Because the gain attributable to the franchises, customer lists, and connecting lines was the result of the construction of the central water system, the gain on these assets was attributable to the property actually constructed by the utility corporations.18 Furthermore, construction may be attributed to a corporation other than the one that actually performed the construction. See Jack Farber, 36 T.C. 1142, aff’d 312 F.2d 729 (2d Cir. 1963). Thus, even if the gain was attributed to the property constructed by the private developers, and this construction was not deemed construction by the corporation, the gain would still be attributed to the “constructed property” for the purpose of section 341(d)(2). As we have held previously in this case, the taxpayer had the burden of proof on the utility stock issues. This burden included the responsibility for proving the amount of gain attributable to assets other than the constructed property,19 and failing to carry this burden, the taxpayer shall not be allowed to prevail on a theoretical application of the limitation.20
In a final argument urging exemption from section 341 treatment, taxpayer suggests that the exception of section 341(e) is applicable. The provisions of section 341(e) were enacted primarily to provide exceptions in situations where property held by corporations, if held by individuals, would have afforded capital gain treatment on its sale.21 The assets of a corporation are considered at both a corporate and shareholder level to determine whether a significant increase in value has occurred of assets which would produce ordinary income upon sale. If the net unrealized appreciation in the “tainted” assets, i. e., or ordinary income assets in the hands of the corporation or certain shareholders, is more than 15 percent, the corporation is not entitled to relief under section 341(e).
Crucial to the application of section 341(e) to a corporation is the definition of [267]*267“subsection (e) assets,” as described in section 341(e)(5)(A) of the statute. Taxpayer in this case bases his argument under section 341(e) on the ground that the utility corporations owned no subsection (e), i. e., ordinary income, assets, and therefore had zero unrealized appreciation in subsection (e) assets. However, taxpayer erroneously bases his position that the corporations held no subsection (e) assets on the assumption that “(t)hese assets as they relate to utility-type corporations have to be inventory, stock in trade or property held primarily for sale to customers in the ordinary course of business.”22 Under section 341(e)(5)(A)(iii), property used in the trade or business23 is a subsection (e) asset if its sale would produce ordinary income in the hands of a more than 20 percent shareholder. The water and sewer systems were such property because they were property used in the trade or business that in the hands of the taxpayer would have produced ordinary income upon sale. The district judge found that the taxpayer was in the business of developing real estate. That finding is not clearly erroneous; in fact, everything in the record regarding taxpayer’s business transactions and corporate involvements supports that finding. Because local ordinances required developers to provide utility services to real estate developments, the business of developing real estate was broad enough to include the development of utility systems. Thus, the gain from the sale of the utility property would have been ordinary income in the hands of the taxpayer. The utility systems owned by South Gate Water and Greater Sarasota Sewer were subsection (e) assets under the definition of section 341(e)(5)(A)(iii). The taxpayer had the burden of proof to show that the statutory requirements of section 341(e) were met. Failing to show that the net unrealized appreciation in the utility systems was not less than 15 percent of the corporation’s net worth, the taxpayer cannot claim the sanctuary of section 341(e).
As the district court found, the statutory requirements of collapsible corporations were satisfied as to the South Gate Water and Greater Sarasota Sewer corporations, and none of the limitations or exceptions applied to prevent collapsible treatment. The district court was not clearly erroneous in its findings of fact and correctly concluded that these corporations were collapsible. We now turn to the question of collapsibility concerning the King & Smith, Inc. corporation.
IV.
As the first corporation in this scenario of development corporations, King & Smith, Inc. was formed on January 15, 1954, to engage in real estate development, and in the middle of that year it acquired the Minute Maid option to purchase 1200 acres of land at $2,000 per acre. In March of 1956 the taxpayer sold his stock in the corporation at a time when the option was the only significant asset of the corporation. The government asserts, and the court below found, that the corporation was a collapsible corporation because the option was property purchased with a view to the sale of stock by its shareholders before the realization by the corporation of a substantial part of the taxable income to be derived from the property. Taxpayer, on the other hand, argues that the option was not “purchased” property within the meaning of section 341(b). Because the “purchased” property provisions apply only to “section 341 assets,” these arguments require consideration of subsection (3) defining “section 341 assets.”
Section 341(b)(3) includes property held for a period of less than three years which is (A) stock in trade of the corporation, or other property of a kind that would properly be included in the inventory of the [268]*268Corporation if on hand at the close of the taxable years; (or) (B) property held by the corporation primarily for sale to customers in the ordinary course of its trade or business ...” 26 U.S.C. 341(b)(3)(A), (B). In the present case the option arguably could be included within the provisions of subsection (A),24 but we find that the property is more reasonably included in the provisions of subsection (B) as property held by the corporation primarily for sale to customers. It is clear from the record that the corporation first held the option to purchase the property in order to develop it. With theN formation of South Gate Development in 1955 the taxpayer intended to continue the real estate development through that corporation by having King & Smith, Inc. sell the right to the option to South Gate Development as the real estate was needed. Although taxpayer sold his stock in King & Smith, Inc. in order to raise capital after only one sale to South Gate Development, the lower court properly found that the corporation held the option primarily for sale to customers in the ordinary course of business. Considering all the relevant factors in this case, we hold that the one sale to South Gate Development followed shortly by the sale of stock of the corporation was sufficient to justify the finding that the option was held primarily for sale to customers. See Estate of Van Heusden v. Commissioner, supra, 369 F.2d at 123.
Taxpayer cites the case of Levenson v. United States, 157 F.Supp. 244 (N.D.Ala. 1957), in support of his argument that the option was not a section 341 asset. That case involved the assignment of rights under an executory contract to purchase approximately 1700 trailers. In that case the defendant conceded that the contract was not stock and trade or property held by the corporation primarily for sale to customers, and the court held that the 1700 trailers subject to the executory contract were not property properly included in the inventory of the corporation. That holding pertained to matters not in issue in this case. Furthermore, the corporation in Levenson was not attempting to sell the contract itself, whereas the corporation in the present case was selling the option to purchase land. The case more appropriate for analogy is Estate of Van Heusden v. Commissioner, supra, 369 F.2d 119, where Judge Tuttle, writing for the court, held that the single sale of an option to purchase land to an ascertained purchaser was a sale of property held by the corporation primarily for sale to customers within the meaning of section 341(b).25
Having determined that the Minute Maid option was a section 341 asset under section 341(b)(3), we must address the taxpayer’s argument that the requisite view as to the sale of stock did not exist. The taxpayer asserts, in a manner similar to his arguments pertaining to the other corporations, that King & Smith, Inc. was formed principally for the construction or development of property rather than for the pur[269]*269chase of the Minute Maid option. As with his previous arguments, the taxpayer ignores the possibility that the corporation was “availed of” for the purchase of the option. Under Treasury Regulation section 1.341-2(a)(3), a corporation is formed or availed of with the requisite view to the action described in section 341(b) if the sale of the stock was attributable to circumstances present at the time of the purchase. At trial the taxpayer testified that King & Smith, Inc. was undercapitalized and used the early earnings from the development project to acquire the Minute Maid option. The sale of the stock was attributed to the necessity to raise money for the development project, a situation present at the time of the purchase of the option. Therefore, the requisite view existed at the time of the sale because the sale was attributed to circumstances existing at the time of the purchase. We hold that the district court was correct in its determination that King & Smith, Inc. was a collapsible corporation, formed or availed of principally for the purchase of a section 341 asset with a view to the sale of stock by its shareholders before the realization by the corporation of a substantial part of the taxable income to be derived from the property.
V.
Taxpayer makes the final argument that the property held by Trust Account 398, in which taxpayer was a 45 percent beneficiary, was a capital asset within the hands of the trust and that the gain attributable to that property was capital gain in the hands of the beneficiaries of the trust. Section 1221 of the Internal Revenue Code26 states the definition of a capital asset and in subsection (1) specifically excludes “property held by the taxpayer primarily for sale to customers in the ordinary course of its trade or business.” Thus, the issue here, as was the issue with the option held by King & Smith, Inc., is whether the property held by Account 398 was held primarily for sale to customers in the ordinary course of business.
The factors to be considered in determining whether property was held primarily for sale to customers are set out in United States v. Winthrop, 417 F.2d 905 (5th Cir. 1969), and approved in Biedenharn Realty Co. v. United States, 526 F.2d 409 (5th Cir.) (en banc), cert. den. 469 U.S. 819, 97 S.Ct. 64, 50 L.Ed.2d 79 (1976). These factors include the taxpayer’s purpose for acquiring the property; the duration of ownership of the property; the extent and nature of taxpayer’s efforts to sell the property; the number, extent, continuity and substantiality of the sales; the extent of subdividing, developing and advertising to increase sales; the use of a business office for sale of the property; the character and degree of supervision or control exercised by the taxpayer over any representative selling the property; and the time and effort that the taxpayer habitually devoted to sales. However, the ultimate determination is not to be made solely on these factors which have no independent significance. The determination of capital gain treatment must be based on the situation in its entirety and made in light of the policy behind the capital gain provisions. See United States v. Winthrop, supra, 417 F.2d at 910-11; Biedenharn Realty Co. v. United States, supra, 526 F.2d at 415. Because the lower capital gain tax is a tax preference not appropriate for profits arising from the operation of a business, the definition of capital asset must be strictly construed and its exclusions broadly applied. Corn Products Co. v. Commissioner, 350 U.S. 46, 52, 76 S.Ct. 20, 24, 100 L.Ed. 29 (1955). On the [270]*270facts of this case, the district judge concluded that the property owned by Account 398 was property held primarily for sale to customers in the ordinary course of business. As we have stated, the district court was not clearly erroneous in its determination that the taxpayer was in the business of real estate development. The property held by Account 398 was sold within three years primarily to real estate development corporations in which the taxpayer was a major shareholder. Under the circumstances involving the closely related corporations, advertising and sales activity by the trust account were unnecessary. Considering the situation under the factors of Winthrop and in its entirety, the property appears to have been held not for investment, but rather primarily for sale to customers in the ordinary course of business. The district court was not clearly erroneous in its determination that the property held by the trust was not a capital asset. See Burgher v. Campbell, 244 F.2d 863 (5th Cir. 1957); Brown v. Commissioner, 448 F.2d 514 (10th Cir. 1971).
Having concluded that the corporations in the case were collapsible and that the income from the trust account was ordinary income, the decision of the lower court is
AFFIRMED.