N.Y. Real Prop. Tax Law § 582

§ 582. Valuation of agricultural structures. Structures used on land\nused in agricultural production located within an agricultural district\nand/or on property receiving an agricultural assessment as provided in\narticle twenty-five-AA of the agriculture and markets law shall be\nassessed at an amount not to exceed the cost of replacement new at\ncurrent prices less a deduction for physical depreciation calculated in\naccordance with the assessor's manual distributed by the office of real\nproperty services, and if applicable, functional and economic\nobsolescence. For the purpose of this section, structures shall be\ndefined as those used:\n 1. For the production or storage of crops, livestock, or livestock\nproducts as defined in section three hundred one of the agriculture and\nmarkets law;\n 2. For the storage of equipment and/or supplies used in such\nproduction;\n 3. In whole or in part as farm labor dwellings, except for structures\nwhich are used as the principal residence of the owner of such\nstructure; or\n 4. For on farm processing or on farm retail merchandising, so long as\nat least seventy-five percent of the annual volume of such processing or\nsuch merchandising utilizes crops, crop products, livestock or livestock\nproducts, as defined in section three hundred one of the agriculture and\nmarkets law, produced on such land owned or operated by such applicant.\n