Vt. Stat. Ann. tit. 27A, § 4-120

If delivery of a public offering statement is required for the sale of a unit, a contract of sale may be executed, but interest in that unit shall be conveyed only after the declaration is recorded and the unit is substantially completed, as evidenced by a recorded certificate of substantial completion executed by an independent architect, professional surveyor, or engineer, or by issuance of a certificate of occupancy.