N.Y. Comp. Codes R. & Regs. tit. 20, § 8186-26.5 – Preparation of classified roll.

(a) The classified roll for the market value survey shall be prepared in the manner prescribed by this section.
(b) Each parcel on the base year roll shall be assigned a code representing the class thereof. Where, however, it is determined that a group of parcels constitute an economic unit, those parcels shall be excluded from the classified roll and an entry representing the economic unit shall be placed thereon. Each economic unit shall be identified and coded as such in addition to being coded as to class.
(c) The assessed value of each parcel for purposes of the classified roll shall be the total assessed value of the parcel on the base year roll, subject to the following qualifications:
1. (1) If the parcel is partially exempt from taxation, the total assessed value of the parcel shall be the total assessed value of the parcel on the base year roll before the subtraction of any partial exemption.
2. (2) If the parcel is wholly exempt from taxation, it shall be excluded from the classified roll; provided, however, that if a portion of such a parcel is used for purposes which render the portion taxable, that portion shall be included on the classified roll and its assessed value shall be the assessed value of that portion on the base year roll.
3. (3) If the parcel is subject to a transition assessment on the base year roll pursuant to section 1805 of the Real Property Tax Law, the total assessed value of the parcel shall be the transition assessment or, if the initial assessment is lesser, the initial assessment.
4. (4) If the parcel is subject to a transition assessment on the base year roll pursuant to section 1904 of the Real Property Tax Law, the total assessed value of the parcel shall be the transition assessment.
(d) The assessed value of each economic unit on the classified roll shall be the sum of the assessed values of the several parcels on the base year roll which comprises the economic unit, subject to the qualifications set forth in subdivision (c) of this section, if applicable.
(e) The following parcels shall be excluded from the classified roll:
1. (1) isolated properties;
2. (2) property which is exempt from taxation pursuant to section 1296 of the Public Authorities Law;
3. (3) property which is exempt from taxation but upon which payments are made in lieu of taxes; and
4. (4) parcels which have an assessed value of zero.
(f) The large units on the classified roll shall be ascertained and coded accordingly.
(g) If the municipality contains more than one survey unit, each parcel and economic unit therein shall be assigned a code designating the survey unit in which it is located.