Mr. Justice Serrano Geyls
delivered the opinion of the Court.
In this condemnation proceeding the petitioners challenge certain rulings of the trial court regarding the admission of some of the evidence as well as the value it fixed on the condemned land. We shall examine the two problems separately.
I
First: As part of their evidence, the petitioners offered an opinion and judgment from the former Tax Court determining the assessment for tax purposes of certain lands [100] similar to the ones condemned herein. The trial court rejected it on the ground that the valuation involved was different from the one required to be established in the suit. It appears in the record as evidence offered but excluded.
Closely related to the former offer, is the one made by the petitioners of the testimony of an assessor from the Treasury Department who, with the pertinent documents at hand, was to testify on the appraisal of the condemned parcels made by the said Department for tax purposes. Relying on Rule 45 of the former Rules of Civil Procedure, the petitioners had obtained from the clerk of the court the issuance of a summons addressed to the Secretary of the Treasury or to his representative ordering these officials to appear in court to testify on the matters described above. The court did not permit the testimony of the witness and held that Rule 34 was applicable and that the petitioners had failed to meet the requisites of good cause and absence of any other remedy which it requires. In view of the considerations set forth below, it would be idle to decide this last procedural question.
The problem of the admissibility of the assessment of a property for tax purposes as evidence of the value of said property for other purposes has been considered in its manifold aspects in numerous cases. Valuation for taxation purposes as admissible to show value for other purposes, 39 A.L.R. 2d 209 (1955); Jahr, Eminent Domain 235-240 (1957) ; 1 Orgel, Valuation under the Law of Eminent Domain 629-645 (1953) ; 5 Nichols, Eminent Domain 313— 324 (1952). The overwhelming majority of courts in the United States has held that said assessed valuation is not competent direct evidence of the value of a property for purposes other than taxation. This rule has been consistently followed in condemnation proceedings in the federal courts as well as in the state courts. A very small minority has accepted the contrary view, but making it clear in many [101] cases, that the above-mentioned evidence, although ádmissible, is of little probative value. State v. Barbe, 24 So.2d 372, 378 (La. 1945); United States v. Phillips, 50 F. Supp. 454, 458 (D.C.Ga. 1943); Fort Worth & D.S. Ry. Co. v. Gilmore, 13 S.W.2d 416, 417 (Tex. 1929).
When it is the condemnor who tries to introduce the evidence of assessed valuation, the courts have refused to accept it adducing technical arguments based on the doctrines of hearsay evidence, res inter alios acta and the lack of participation on the part of the landowner in the assessment proceeding.1 Suffolk & C. Ry. Co. v. West End Land & Improvement Co., 49 S.E. 350, 351 (N.C. 1904); Girard Trust Co. v. City of Philadelphia, 93 Atl. 947, 948 (Pa. 1915); Kansas City & G. Ry. Co. v. Haake, 53 S.W.2d 891, 892-894 (Mo. 1932); United States v. Certain Parcels of Land, 261 F.2d 287, 289-291 (4th Cir. 1958). However, in this situation as well as when the owner of the property offers the evidence, the unreliability of said evidence as an index of market value, has been adduced with great emphasis together with the well-known fact that these assessed valuations serve several purposes and not merely the precise determination of the market value of the property. Savannah Sugar Refining Corp. v. Atlantic Towing Co., 15 F.2d 648, 650 (5th Cir. 1926); Bankers Trust Co. v. International Trust Co., 113 P.2d 656, 660 (Colo. 1941); State v. Barbe, supra at 373 (D.C. Cir. 1931); In re Northlake Ave., 165 Pac. 113, 114 (Wash. 1917); 5 Nichols, op. cit. at 316; Jahr, op. cit. at 235. The well-known doctrine that a determination made by a public official cannot bind the state in a sphere of official action beyond the domain of authority of said official has also been opposed to the land[102] owners’ petition. In re Northlake Ave., supra at 114. A federal court2 has convincingly stated this argument:
“The power of a tax official to bind the public is limited, and what he does for purposes of taxation, should not be binding upon the public, or prejudicial to the public interest, when other public officials are engaged in the performance of a very different public function in an unrelated field. Though the tax official may purport to use market value as the criterion of assessed value, his primary concern is with relative, not absolute, values, but however he exercises his judgment for purposes of a reasonable distribution of the tax burden, his act, as an extrajudicial declaration, may not circumscribe the interest of the public in the difficult process of determining just compensation for property taken for public use.”
It is now convenient to examine as briefly as possible some aspects of the system existing at present for the assessment of property for taxation purposes. By virtue of Act No. 117 of May 9, 1947 (Sess. Laws, p.. 262, 13 L.P.R.A. 431 et seq.) a system called “scientific assessment” was established in Puerto Rico, according to which a general assessment was made in 1951 and a re-appraisement in 1958-59.
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Mr. Justice Serrano Geyls
delivered the opinion of the Court.
In this condemnation proceeding the petitioners challenge certain rulings of the trial court regarding the admission of some of the evidence as well as the value it fixed on the condemned land. We shall examine the two problems separately.
I
First: As part of their evidence, the petitioners offered an opinion and judgment from the former Tax Court determining the assessment for tax purposes of certain lands [100] similar to the ones condemned herein. The trial court rejected it on the ground that the valuation involved was different from the one required to be established in the suit. It appears in the record as evidence offered but excluded.
Closely related to the former offer, is the one made by the petitioners of the testimony of an assessor from the Treasury Department who, with the pertinent documents at hand, was to testify on the appraisal of the condemned parcels made by the said Department for tax purposes. Relying on Rule 45 of the former Rules of Civil Procedure, the petitioners had obtained from the clerk of the court the issuance of a summons addressed to the Secretary of the Treasury or to his representative ordering these officials to appear in court to testify on the matters described above. The court did not permit the testimony of the witness and held that Rule 34 was applicable and that the petitioners had failed to meet the requisites of good cause and absence of any other remedy which it requires. In view of the considerations set forth below, it would be idle to decide this last procedural question.
The problem of the admissibility of the assessment of a property for tax purposes as evidence of the value of said property for other purposes has been considered in its manifold aspects in numerous cases. Valuation for taxation purposes as admissible to show value for other purposes, 39 A.L.R. 2d 209 (1955); Jahr, Eminent Domain 235-240 (1957) ; 1 Orgel, Valuation under the Law of Eminent Domain 629-645 (1953) ; 5 Nichols, Eminent Domain 313— 324 (1952). The overwhelming majority of courts in the United States has held that said assessed valuation is not competent direct evidence of the value of a property for purposes other than taxation. This rule has been consistently followed in condemnation proceedings in the federal courts as well as in the state courts. A very small minority has accepted the contrary view, but making it clear in many [101] cases, that the above-mentioned evidence, although ádmissible, is of little probative value. State v. Barbe, 24 So.2d 372, 378 (La. 1945); United States v. Phillips, 50 F. Supp. 454, 458 (D.C.Ga. 1943); Fort Worth & D.S. Ry. Co. v. Gilmore, 13 S.W.2d 416, 417 (Tex. 1929).
When it is the condemnor who tries to introduce the evidence of assessed valuation, the courts have refused to accept it adducing technical arguments based on the doctrines of hearsay evidence, res inter alios acta and the lack of participation on the part of the landowner in the assessment proceeding.1 Suffolk & C. Ry. Co. v. West End Land & Improvement Co., 49 S.E. 350, 351 (N.C. 1904); Girard Trust Co. v. City of Philadelphia, 93 Atl. 947, 948 (Pa. 1915); Kansas City & G. Ry. Co. v. Haake, 53 S.W.2d 891, 892-894 (Mo. 1932); United States v. Certain Parcels of Land, 261 F.2d 287, 289-291 (4th Cir. 1958). However, in this situation as well as when the owner of the property offers the evidence, the unreliability of said evidence as an index of market value, has been adduced with great emphasis together with the well-known fact that these assessed valuations serve several purposes and not merely the precise determination of the market value of the property. Savannah Sugar Refining Corp. v. Atlantic Towing Co., 15 F.2d 648, 650 (5th Cir. 1926); Bankers Trust Co. v. International Trust Co., 113 P.2d 656, 660 (Colo. 1941); State v. Barbe, supra at 373 (D.C. Cir. 1931); In re Northlake Ave., 165 Pac. 113, 114 (Wash. 1917); 5 Nichols, op. cit. at 316; Jahr, op. cit. at 235. The well-known doctrine that a determination made by a public official cannot bind the state in a sphere of official action beyond the domain of authority of said official has also been opposed to the land[102] owners’ petition. In re Northlake Ave., supra at 114. A federal court2 has convincingly stated this argument:
“The power of a tax official to bind the public is limited, and what he does for purposes of taxation, should not be binding upon the public, or prejudicial to the public interest, when other public officials are engaged in the performance of a very different public function in an unrelated field. Though the tax official may purport to use market value as the criterion of assessed value, his primary concern is with relative, not absolute, values, but however he exercises his judgment for purposes of a reasonable distribution of the tax burden, his act, as an extrajudicial declaration, may not circumscribe the interest of the public in the difficult process of determining just compensation for property taken for public use.”
It is now convenient to examine as briefly as possible some aspects of the system existing at present for the assessment of property for taxation purposes. By virtue of Act No. 117 of May 9, 1947 (Sess. Laws, p.. 262, 13 L.P.R.A. 431 et seq.) a system called “scientific assessment” was established in Puerto Rico, according to which a general assessment was made in 1951 and a re-appraisement in 1958-59.
The scientific assessment of property, both in Puerto Rico as well as in other jurisdictions, is not made for the purpose of determining the exact market value of real property. Section 2 of the above-cited Act directs the Treasurer “to establish valuation and assessment standards with such accuracy and scientific details as will permit the fixing of adequate and equitable rates of valuation of property for taxation purposes.” Section 3 [as amended by Act No. 37 of 1951] adds that: “The Treasurer shall classify and assess all real property in its actual and effective value by utilizing any of the methods and factors recognized with respect to property valuation and assessment, so that the assessments for each of the different types of property may [103] be uniform.” 3 The official publications indicate that the aims of the scientific assessment are to establish a fair valuation system for taxation purposes, the uniformity in the assessment and “unit values of assessment based on the market value of the property.” 4 It is obvious that the administrators of this system will continually have to make adjustments to reconcile these three objectives. Besides, it is a well-known fact that all tax systems are unavoidably sensitive to the economical and political necessities of the community they serve, and that this sensitivity inevitably increases in the case of assessment of real property, since the latter is the basis for the borrowing capacity of a state. For these reasons a well-known authority in the field of public finance states that the purpose of a scientific assessment system should not be to determine the actual value of the property, but to establish a reasonable and equitable basis for taxation. Taylor, The Economics of Public Finance 301 (1953). Contrary to the former view, the courts are required to make an intense and thorough search in condemnation proceedings in order to establish as precise as possible the market value of a determined property at the time the official taking takes place.
However, it may be stated that, even accepting the above-mentioned difference between the objectives of both types of valuation, the assessed valuation would still be of some [104] .service if it is the landowner who offers it as a minimum index of the market value of the property, which is to .be weighed together with other pertinent evidence. Cf. Louisiana Highway Commission v. Giaccone, 140 So. 286, 290 (La. 1932).
This proposition, of course, does not overcome some of the technical obstacles applicable to the assessed valuation which, as we have seen, have been indicated by the case law of the United States,5 but it does keep its validity where the landowner, as in the case at bar, offers the testimony -of an officer who participated in the assessment proceeding and not a mere certificate thereof. Therefore, we must examine the above-mentioned assessment proceeding.
The manner in which the assessment of 1951 was made by the employees in charge thereof has been described in •the following manner in an official publication:
“Many persons participate in the new system for the assessment of property, some doing one thing while others do other ■things, until the assessed value is fixed.
“Some prepare the tables of unit values after much study and investigation, others inspect the properties and note down in cards the measurements and other data about each property, others classify the property following all the details which appear in the cards, and finally, the cards come to the central office where another group of employees multiply the costs or ■unit values by the measurements or details which appear in the cards thereby obtaining the assessed valuation of the property.” 6
As it may be observed, the scientific assessment of a property is the result of a collective effort made by the employees of a government organization and not the work [105] of one person alone. Moreover, the “costs” or “unit values” which serve as a basis for determining the market value of the property were obtained after a thorough investigation at different sources, but particularly after long conversations with experts in that matter and on the advice offered by a committee appointed for those purposes. When a reappraisal of the property was made some six years later, “there was no need to again inspect minutely the properties one by one. The physical inventory of each property was already made when each property was assessed for the first time under the System of Scientific Assessment. It was only necessary to readjust the former values according to the change in values that had taken place during the last years.”7
Therefore, one person alone even in the case of an executive, of those who intervened in this complicated proceeding, would not be competent to offer testimony, of his own knowledge, regarding all the elements which integrate the assessed valuation, when the latter is offered as evidence of the value of the condemned property. To overcome this obstacle, it would be necessary to offer the testimony of all the persons who in one way or another have participated in this proceeding. In the hypothesis, although highly improbable, that this could be done, it would be necessary to reproduce in the [106] condemnation suit all the details of the assessed valuation proceeding. This evidence, of course, would have to be admitted from the landowner as well as from the condemnor.
In short, the system of real property assessment for taxation purposes does not seek a completely individualized valuation of each property in order to determine with the greatest possible accuracy its true market value, but on the contrary, is based on norms and standards of general application to properties which are similarly located, and it has other additional objectives and answers certain economic and political necessities which can have no weight whatever on a valuation for condemnation purposes. The final determination of that assessed valuation is the product of a complex proceeding in which numerous persons intervene directly. The scant light which this official determination or the testimony regarding it may shed in some isolated cases would not compensate in any way whatsoever the confusions and. delays— “a concession to the shortness of life,” as phrased by Holmes — which would necessarily result when the scalpel of cross-examination penetrates deeply into the complex anatomy of that system in order to extricate those elements which may be persuasive in a condemnation proceeding. This is a clear example of technically admissible evidence which should not be admitted for powerful reasons of a normative character.8
Besides, an examination of the applicable legal provisions reasserts that the Legislative Assembly was aware of the difficulties which we have described. Section 3 of the above-cited Act of 1947, as amended by Act No. 228 of May 5, [107]*1071950 (Sess. Laws, p. 580, 13 L.P.R.A. § 432) provides in. its last sentence that: “The returns, cards, plans, maps, photographs, schedule, charts, and all other documents and information obtained and used by the Secretary of the Treasury in classifying, valuating, and assessing property by the scientific method herein prescribed, shall be evidence and shall constitute prima facie proof, for taxation purposes, of the circumstances and of the assessed valuation of the property to which they refer, and as such shall be admitted as evidence by the courts of Puerto Rico; Provided, that the Secretary of the Treasury or any agent designated by him may testify on the information contained in such evidence and its relationship with the value of the said property to which it refers.” (Italics ours.) The legislative declaration which orders the limitation of this evidence to “taxation purposes” is subject to other legal provisions even in the taxation field itself. Thus, for example, in the case of inheritance and gifts taxes, the pertinent law authorizes the Secretary of the Treasury to order the appraisal of “all estates granted or the object of a grant, as the case may be, at their market value as of the date of the death or of the grant.” 13 L.P.R.A. § 895. It is known that that special assessment is made in all cases. In the field of income taxes, examples may be cited also of some special assessments which ought to be made at a certain time and for the purpose of obtaining the “market value” of certain specific properties.