Section 4209 - Exercise of development rights(a) General rule.--To exercise any development right reserved under section 4205(a)(8) (relating to contents of declaration), the declarant shall prepare, execute and record an amendment to the declaration (section 4216). If the exercise of such development rights causes real estate to be added to a cooperative or withdrawn from a cooperative, the amendment to the declaration shall either convey or refer to the instrument conveying the real estate so added or withdrawn and shall contain a legally sufficient description of the real estate. The amendment to the declaration must also assign an identifying number to each new unit created, if appropriate, and reallocate the allocated interests among all cooperative interests. The amendment must also describe any common elements and any limited common elements thereby created and, in the case of limited common elements, designate the unit to which each is allocated to the extent required by section 4208 (relating to limited common elements).(b) Reservation of development rights.--Development rights may be reserved within any real estate added to the cooperative if the amendment adding that real estate includes all matters required by section 4205 or 4206 (relating to leasehold cooperatives), as the case may be. This provision does not extend the time limit on the exercise of development rights imposed by the declaration pursuant to section 4205(b)(1).(c) Subdivision or conversion of unit.--Whenever a declarant exercises a development right to subdivide or convert a unit previously created into additional units, common elements or both:(1) If the declarant converts the unit entirely to common elements, the amendment to the declaration must reallocate all the allocated interests of the cooperative interest of which that unit is a part among the other cooperative interests as if that unit had been taken by eminent domain (section 4107).(2) If the declarant subdivides the unit into two or more units, whether or not any part of the unit is converted into common elements, the amendment to the declaration must reallocate all the allocated interests of the cooperative interests created by the subdivision in any reasonable manner prescribed by the declarant.(d) Withdrawal of real estate.--If the declaration provides, pursuant to section 4205(a)(8), that all or a portion of the real estate is subject to the development right of withdrawal: (1) If all of the real estate is subject to withdrawal and the declaration does not describe separate portions of real estate subject to that right, none of the real estate may be withdrawn after a cooperative interest has been conveyed to a purchaser.(2) If a portion or portions are subject to withdrawal, no portion may be withdrawn after a cooperative interest in the portion has been conveyed to a purchaser.1992, Dec. 18, P.L. 1426, No. 176, § 1, effective in 60 days.