Vt. Stat. Ann. tit. 27A, § 2-122

If the right to add unspecified real estate is reserved in the declaration of a planned community, the declarant, in addition to any other development right, may amend the declaration at any time during the time specified in the declaration to add additional real estate to the planned community without describing that real estate in the original declaration, provided the amount of real estate added to the planned community does not exceed 10 percent of the real estate described in subdivision 2-105(a)(3) of this title and the number of units is not increased beyond the number stated in the original declaration.