GALLAGHER, Associate Judge:
This is a petition for review of an order of the Board of Zoning Adjustment (BZA) denying an appeal from a decision of the Chief of the Zoning Inspection Branch.1 That decision, if upheld and enforced, would require petitioner to remove from a backyard structure — which has been and is now used as a residential rental property — those plumbing and electrical items which render the building suitable for human habitation. The building concededly does not comply with the applicable zoning regulation, but petitioner argues that the BZA erred in not finding the District of Columbia government (District) estopped from enforcing that regulation with respect to his property. The peculiar facts of this case are crucial to our decision and thus are recounted in detail.
In June of 1967, a building permit was issued to petitioner’s predecessor in interest, Cecile deRochefort, for the erection of an accessory structure — a shed for the storage of garden tools — at 3267 P Street, N.W. The shed was completed in October of that same year. The shed was built with aluminum siding and the value of the work set at $1,200.
The following month, on November 15, a second building permit was issued to Mrs. deRochefort for the stated purpose of repair, authorizing the construction of a new fireplace, partitions for a new bathroom, and some electrical wiring work — the stated value of which was $260. The application for this permit stated the present use of the building as “Priv. Home” and the issued permit recites the occupational use as a dwelling. The drawing accompanying the application describes the work as being done to the “recreation room”. The work [9]*9described in the permit was done to the backyard structure which had been erected under the authority of the first permit issued to Mrs. deRochefort. Twice before work had commenced on the structure and at least twice during work on it, an inspector visited the site.
Several months after completion of the work described in the second permit, the Zoning Administrator sent a letter dated July 2, 1968, to Mrs. deRochefort informing her that the second permit had been issued erroneously due to a misstatement of fact in the permit application — i. e., that the present use of the building was as a private home. Furthermore, the letter ordered her “to remove those items of a plumbing and electrical nature which by their presence make the structure suitable for human habitation and discontinue use of the structure for human habitation.” This order was based on her purported violation of a zoning regulation2 in using the structure as a dwelling.
After this order with its threat of enforcement, no other action on the part of the zoning authorities occurred until three years later in February 1971, at which time a letter almost identical to that of July 2, 1968, was sent to her. Again, despite this warning of potential penalties, no further enforcement action was taken. Under unclear circumstances, however, an inspector noted on July 12, 1971, that the “bldg, in question is now used as a tool shed only.”3
Petitioner purchased the property at 3267 P Street, N.W., in May 1974. On December 2, 1974, the Chief of the Zoning Inspection Branch sent a notice to petitioner advising him of the zoning violation and ordering him to dismantle the offensive structure, reverting its use to a tool shed in accordance with the first permit. Mr. Wieck appealed to the BZA from that order. At the BZA hearing, petitioner’s counsel argued that the zoning officials were estopped from enforcing the zoning regulation violated by the backyard structure. In denying the appeal, the BZA declined to rule on the estoppel issue asserting that sufficient material facts — particularly the testimony of Mrs. deRochefort, whom the BZA had no authority to subpoena — were not introduced to enable it to weigh the equities of the parties involved.
The applicable standard of review is set out in D.C.Code 1973, § 1-1510. See § 11-722; Hubbard v. District of Columbia Board of Zoning Adjustment, D.C.App., 366 A.2d 427 (1976). Thus, this court has the power
(3) to hold unlawful and set aside any action or findings and conclusions found to be (A) arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law; ... or (E) unsupported by substantial evidence in the record of the proceedings before the court. [§ 1-1510(3).]
Our duty on review of this BZA order is “[to] determine whether findings made ‘are supported by and in accordance with reliable, probative, and substantial evidence in [10]*10the whole administrative record, Schiffmann v. ABC Board, D.C.App., 302 A.2d 235 (1973), and whether the conclusions of the Board flow rationally from these findings, Stewart v. BZA, D.C.App., 305 A.2d 516 (1973).’ Marjorie Webster Junior College, Inc. v. BZA, D.C.App., 309 A.2d 314, 319 (1973).” Dietrich v. District of Columbia Board of Zoning Adjustment, D.C.App., 320 A.2d 282, 285 (1974).
The BZA concluded, on the basis of its findings and the record, that the estoppel “issue raised by [petitioner] is not supported by sufficient facts to enable the Board to decide that issue.” The Board then stated vaguely that such an issue must be “decided by weighing the equities of the parties involved, based upon a factual determination by the Board as to the actions of those parties.” In deciding not to rule on the asserted estoppel, the BZA relied principally upon its failure to determine why the second permit was issued.4 The BZA erred, however, as there is sufficient evidence in the record to rule on petitioner’s estoppel argument.
Due to the important general public interest in the integrity and enforcement of zoning regulations, the affirmative defenses of estoppel and laches are not judicially favored. See, e. g., Nathanson v. District of Columbia Board of Zoning Adjustment, D.C.App., 289 A.2d 881, 884 (1972); People v. County of Kern, 39 Cal.App.3d 830, 115 Cal.Rptr. 67 (Dist.Ct.App.1974). Furthermore, as stated in District of Columbia v. Stewart, D.C.App., 278 A.2d 117, 119 (1971):
While estoppel may be applied to the District of Columbia in certain limited situations when the equities are strongly in favor of the party invoking the doctrine (District of Columbia v. Cahill, 60 App.D.C. 342, 54 F.2d 453 (1931), cited in footnote], the District of Columbia must first have authority to act before conduct of its employees can be the basis of an estoppel defense. National Hospital Service Society, Inc. v. Jordan, 76 U.S.App. D.C. 26, 128 F.2d 460, cert. denied, 317 U.S. 664, 63 S.Ct. 65, 87 L.Ed. 534 (1942). [Footnote omitted.]
The Board argued here that the zoning officials had no authority to issue the second permit,5 and that, therefore, under District of Columbia v. Stewart, supra, and National Hospital Service Society, Inc. v. Jordan, supra,
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GALLAGHER, Associate Judge:
This is a petition for review of an order of the Board of Zoning Adjustment (BZA) denying an appeal from a decision of the Chief of the Zoning Inspection Branch.1 That decision, if upheld and enforced, would require petitioner to remove from a backyard structure — which has been and is now used as a residential rental property — those plumbing and electrical items which render the building suitable for human habitation. The building concededly does not comply with the applicable zoning regulation, but petitioner argues that the BZA erred in not finding the District of Columbia government (District) estopped from enforcing that regulation with respect to his property. The peculiar facts of this case are crucial to our decision and thus are recounted in detail.
In June of 1967, a building permit was issued to petitioner’s predecessor in interest, Cecile deRochefort, for the erection of an accessory structure — a shed for the storage of garden tools — at 3267 P Street, N.W. The shed was completed in October of that same year. The shed was built with aluminum siding and the value of the work set at $1,200.
The following month, on November 15, a second building permit was issued to Mrs. deRochefort for the stated purpose of repair, authorizing the construction of a new fireplace, partitions for a new bathroom, and some electrical wiring work — the stated value of which was $260. The application for this permit stated the present use of the building as “Priv. Home” and the issued permit recites the occupational use as a dwelling. The drawing accompanying the application describes the work as being done to the “recreation room”. The work [9]*9described in the permit was done to the backyard structure which had been erected under the authority of the first permit issued to Mrs. deRochefort. Twice before work had commenced on the structure and at least twice during work on it, an inspector visited the site.
Several months after completion of the work described in the second permit, the Zoning Administrator sent a letter dated July 2, 1968, to Mrs. deRochefort informing her that the second permit had been issued erroneously due to a misstatement of fact in the permit application — i. e., that the present use of the building was as a private home. Furthermore, the letter ordered her “to remove those items of a plumbing and electrical nature which by their presence make the structure suitable for human habitation and discontinue use of the structure for human habitation.” This order was based on her purported violation of a zoning regulation2 in using the structure as a dwelling.
After this order with its threat of enforcement, no other action on the part of the zoning authorities occurred until three years later in February 1971, at which time a letter almost identical to that of July 2, 1968, was sent to her. Again, despite this warning of potential penalties, no further enforcement action was taken. Under unclear circumstances, however, an inspector noted on July 12, 1971, that the “bldg, in question is now used as a tool shed only.”3
Petitioner purchased the property at 3267 P Street, N.W., in May 1974. On December 2, 1974, the Chief of the Zoning Inspection Branch sent a notice to petitioner advising him of the zoning violation and ordering him to dismantle the offensive structure, reverting its use to a tool shed in accordance with the first permit. Mr. Wieck appealed to the BZA from that order. At the BZA hearing, petitioner’s counsel argued that the zoning officials were estopped from enforcing the zoning regulation violated by the backyard structure. In denying the appeal, the BZA declined to rule on the estoppel issue asserting that sufficient material facts — particularly the testimony of Mrs. deRochefort, whom the BZA had no authority to subpoena — were not introduced to enable it to weigh the equities of the parties involved.
The applicable standard of review is set out in D.C.Code 1973, § 1-1510. See § 11-722; Hubbard v. District of Columbia Board of Zoning Adjustment, D.C.App., 366 A.2d 427 (1976). Thus, this court has the power
(3) to hold unlawful and set aside any action or findings and conclusions found to be (A) arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law; ... or (E) unsupported by substantial evidence in the record of the proceedings before the court. [§ 1-1510(3).]
Our duty on review of this BZA order is “[to] determine whether findings made ‘are supported by and in accordance with reliable, probative, and substantial evidence in [10]*10the whole administrative record, Schiffmann v. ABC Board, D.C.App., 302 A.2d 235 (1973), and whether the conclusions of the Board flow rationally from these findings, Stewart v. BZA, D.C.App., 305 A.2d 516 (1973).’ Marjorie Webster Junior College, Inc. v. BZA, D.C.App., 309 A.2d 314, 319 (1973).” Dietrich v. District of Columbia Board of Zoning Adjustment, D.C.App., 320 A.2d 282, 285 (1974).
The BZA concluded, on the basis of its findings and the record, that the estoppel “issue raised by [petitioner] is not supported by sufficient facts to enable the Board to decide that issue.” The Board then stated vaguely that such an issue must be “decided by weighing the equities of the parties involved, based upon a factual determination by the Board as to the actions of those parties.” In deciding not to rule on the asserted estoppel, the BZA relied principally upon its failure to determine why the second permit was issued.4 The BZA erred, however, as there is sufficient evidence in the record to rule on petitioner’s estoppel argument.
Due to the important general public interest in the integrity and enforcement of zoning regulations, the affirmative defenses of estoppel and laches are not judicially favored. See, e. g., Nathanson v. District of Columbia Board of Zoning Adjustment, D.C.App., 289 A.2d 881, 884 (1972); People v. County of Kern, 39 Cal.App.3d 830, 115 Cal.Rptr. 67 (Dist.Ct.App.1974). Furthermore, as stated in District of Columbia v. Stewart, D.C.App., 278 A.2d 117, 119 (1971):
While estoppel may be applied to the District of Columbia in certain limited situations when the equities are strongly in favor of the party invoking the doctrine (District of Columbia v. Cahill, 60 App.D.C. 342, 54 F.2d 453 (1931), cited in footnote], the District of Columbia must first have authority to act before conduct of its employees can be the basis of an estoppel defense. National Hospital Service Society, Inc. v. Jordan, 76 U.S.App. D.C. 26, 128 F.2d 460, cert. denied, 317 U.S. 664, 63 S.Ct. 65, 87 L.Ed. 534 (1942). [Footnote omitted.]
The Board argued here that the zoning officials had no authority to issue the second permit,5 and that, therefore, under District of Columbia v. Stewart, supra, and National Hospital Service Society, Inc. v. Jordan, supra, the petitioner is barred from asserting estoppel.6 In the leading case of [11]*11District of Columbia v. Cahill, 60 App.D.C. 342, 54 F.2d 453 (1931), where estoppel was applied in a zoning suit, the court did not specifically consider the issue of the official’s authority as bearing on the application of the doctrine against the District, but focused on the particular elements of estop-pel and particularly on the relative equities of the two parties. We do not reach this issue,7 however, since we find that petitioner has not conclusively proved all the elements of equitable estoppel.
The petitioner relies primarily on Cahill to establish estoppel. The necessary elements are: a party (1) acting in good faith, (2) on affirmative acts of a municipal corporation, (3) makes expensive and permanent improvements in reliance thereon, and (4) the equities strongly favor the party invoking the doctrine. See, e. g., Cahill, supra at 344, 54 F.2d at 454-55. Furthermore, the reliance of the party must be justifiable. Nathanson v. District of Columbia Board of Zoning Adjustment, supra at 884.
The record does not demonstrate petitioner’s justifiable reliance on any affirmative acts of District zoning officials. Petitioner does not point to anything the zoning officials did upon which he relied to his detriment nor does the record disclose any reliance-provoking conduct. There is no evidence which indicates that petitioner knew of, much less relied upon, the issuance of the second permit. Rather, his reliance resulted from the inaction of the zoning officials — the failure to enforce their two prior orders of 1968 and 1971. A failure to act is not equivalent to an affirmative act. Moreover, inaction ordinarily is not sufficient to raise an estoppel. See City of Evanston v. Robbins, 117 Ill.App.2d 278, 254 N.E.2d 536 (1970); Rye Beach Village District v. Beaudoin, 114 N.H. 1, 315 A.2d 181 (1974); Salt Lake County v. Kartchner, 552 P.2d 136 (Utah 1976).8
Our inquiry has not ended, however, until we consider the application of laches to this situation. Although not specifically pleaded as a defense to enforcement before the BZA or before this court, the substance of a laches defense is apparent from the petitioner’s equitable arguments — particularly those focusing on the longlasting failure of the proper officials to enforce their previous orders and the consequent prejudice to petitioner from their present attempted enforcement.
“Laches is a species of estoppel, being defined as the omission to assert a right for an unreasonable and unsatisfactorily explained length of time under circumstances prejudicial to the party asserting laches.” 3 Rathkopf, Law of Zoning and Planning, at 67-1 (3d ed. 1972). It is often claimed “where the inactivity of the officials charged with the enforcement of the ordinance has misled the owner into acts in violation of the ordinance ... or has misled persons into purchasing the property in ignorance of the illegality of the use or structure.” Id. at 67-2. As previously stated, a claim of laches in the zoning context is not judicially favored and is rarely applied “except in the clearest and most compelling circumstances[,]” Moore v. Bridgewater Township, 69 N.J.Super. 1,173 A.2d 430 (App.Div.1961). Where a party can prove inexcusable delay which has resulted in substantial prejudice, however, laches may be found. Amidon v. Amidon, D.C.App., 280 A.2d 82, 84 (1971).
Here, the first enforcement order was sent to Mrs. deRochefort in July of 1968, the second order was sent to her in February of 1971, and the third order was sent to petitioner in December of 1974 — amounting [12]*12to a delay of almost six and one-half years. The record does not disclose any sufficient reasons for this delay.
If, at any time prior to May of 1974, when petitioner bought the P Street property, the zoning officials had followed up on the two prior enforcement orders, the petitioner might not have purchased the property, or if he had, he would not have done so in reliance on the presence of a valuable rental dwelling in the backyard. The petitioner purchased the property for $165,000 and presented some evidence that the offending building was an asset worth approximately $25,000. The BZA, however, found that petitioner failed to present “the precise measure of injury in dollars and cents which would result from his having to remove the facilities in question.” Although petitioner did not present evidence of the “precise measure of injury” in that he did not demonstrate how much the actual removal of the facilities would cost, we believe petitioner’s showing of injury— from the loss of an income-producing property, the value of which was indubitably reflected in his purchase price — to be sufficient to find substantial prejudice9 to him as a result of the zoning officials’ inexcusable delay.
In re Heidorn’s Appeal, 412 Pa. 570, 195 A.2d 349 (1963)10 is of interest. There, the Heidorns purchased a house in 1953, which had violated a 1942 local zoning ordinance ever since it had been built in 1950. A stone stoop and wooden overhang projected from the front door of the house in violation of an ordinance which imposed a 25 foot setback requirement. A similarly restrictive ordinance was enacted in 1958. In 1959 the Heidorns replaced the stoop and overhang with an aluminum awning which was about 12 feet wider and projected 3% more feet towards the front street. Shortly thereafter the municipal officials informed the Heidorns that their awning encroached on the setback territory. The Pennsylvania Supreme Court affirmed the lower court’s holding “that since the Township had allowed approximately 10 years to pass without objecting to the ordinance violation, it was guilty of laches and could not now sustain a violation on the basis of the original ordinance of 1942.” (Footnote omitted.) In re Heidorn’s Appeal, supra, 195 A.2d at 351. The court dismissed as unwarranted the Township’s concern over the preceden-tial value of this case as affecting setback violations.
As the Pennsylvania Supreme Court stated in In re Heidorn’s Appeal, supra, 195 A.2d at 351:
While courts are reluctant, and should be, to impose the sanction of laches on governmental divisions, equity cannot close its eyes to the sloth, indifference or official neglect of a municipal body any more than it can to the neglect of an individual where such neglect harms an innocent person.
Here the delay involved was six and one-half years and it was inexcusable since neither of the prior enforcement orders were actually pursued, let alone diligently pursued, and for no sufficiently demonstrated reasons. The substantial prejudice which would be imposed on petitioner, the new property owner, if enforcement were now upheld, involves the partial dismantling of a building which provides him with rental income, and for which he doubtless made a sizeable capital investment included in the purchase price for the P Street property. Any conceivable harm to the general public interest from not enforcing the zoning regulation in this case is not sufficient to outweigh the inequity of substantial prejudice to petitioner. Under these extraordinary and compelling circumstances, and with actual notice by the government being present for such a long period, we reverse [13]*13the decision of the BZA as not being in accordance with law and hold that the District is barred from enforcing the applicable zoning regulation against petitioner due to laches. In zoning, as in other areas of the law, the government can be in the wrong. In zoning, the equities can be so compelling as to favor the individual property owner. Accordingly, the BZA order upholding the enforcement order of the Chief of the Zoning Inspection Branch is vacated and the cause remanded for disposition consistent with this opinion.
So ordered.