N.Y. Comp. Codes R. & Regs. Tit. 16 § 322.3
The cost of property includes the cost of preliminary surveys and studies and the cost of preparing plans and specifications at the time of construction for construction projects which are undertaken, and also the cost of keeping the construction accounts during the construction period, together with the cost of maps, books, files and other systems employed and permanently preserved in support of such construction costs. The cost of property does not include the cost incurred subsequent to the construction period of preparing, installing or maintaining maps, inventories, accounting and other financial records of property for use in the operation of a constructed plant, the cost of the preparation of inventories, appraisals, or other studies, nor costs incurred in the establishment or revision of accounting routine.