
69 N.Y.2d 994 (1987)
Credit Exchange, Inc., Respondent,
v.
461 Eighth Avenue Associates, Appellant.
Court of Appeals of the State of New York.
Argued April 28, 1987.
Decided May 28, 1987.
Glenn Backer for appellant.
Herbert L. Finkelstein for respondent.
Chief Judge WACHTLER and Judges SIMONS, KAYE, ALEXANDER, TITONE, HANCOCK, JR., and BELLACOSA concur in memorandum.
*996MEMORANDUM.
The order of the Appellate Division, insofar as appealed *997 from, should be affirmed, with costs, and the certified question answered in the affirmative.
We agree with the Appellate Division that triable issues of fact exist as to whether, and to what extent, the increased assessment for the 1985-1986 tax year was attributable to improvements made for the exclusive benefit of the landlord. We view the lease provision at issue in light of the essential purpose of a tax escalation clause in commercial landlord-tenant leases  to pass on to the tenant the proportionate share of increases in real estate taxes (see, 33 NY Jur, Landlord-Tenant, § 187; 1 Friedman, Leases § 5.401 [2d ed]). It is not the aim of such a clause, ordinarily, to impose upon the tenant responsibility for increases in real estate taxes resulting from improvements on the property redounding solely to the benefit of the landlord, such as the addition of two floors as was the case here. (See, People ex rel. Hudson Riv. Day Line v Franck, 257 N.Y. 69; People ex rel. International Nav. Co. v Barker, 153 N.Y. 98; Marano v Corbisiero, 27 Misc 2d 830; see generally, 33 NY Jur, Landlord-Tenant, § 192).
The Appellate Division erred, however, in concluding that plaintiffs were not liable for their proportionate share of the tax increase beyond the expiration date of their lease. Real estate taxes for the tax year 1985-1986 were fixed and imposed as of July 1, 1985, during the term of the lease. Thus, the tenant's obligation to pay its proportionate share of the increase accrued on that date. The fact that the lease provided for payment of this obligation in installments, some of which fell due beyond the lease term, does not operate to diminish tenant's obligation (Wall v Hess, 232 N.Y. 472; see, 1 Rasch, New Landlord & Tenant  Summary Proceedings § 430 [2d ed]).
Order, insofar as appealed from, affirmed, etc.
