D.C. Code § 47-850.01
Section 3 of D.C. Law 14-147 provided that section 2 shall apply as of October 1, 2001, except insofar as the retroactive application results in an increase of tax to the real property or owner thereof.
Section 3 of Law 15-135 provided that § 2(a), (b), and (c)(3) of the act shall apply as of October 1, 2003.
Section 1083 of D.C. Law 16-33 provided that § 1082(a)(1), (b), (d)(1), and (d)(2)(B) shall apply for taxable years beginning after September 30, 2005.
Applicability of D.C. Law 16-98: Section 3(a) of D.C. Law 16-98 provided: "(a) Section 2(a), (b), and (c) shall apply as of October 1, 2006."
Effectiveness and expiration of D.C. Law 16-98: Section 4 of D.C. Law 16-98 required that "this act shall take effect subject to the inclusion of its fiscal effect in an approved budget and financial plan; provided, that this act shall expire on October 1, 2006 if its fiscal effect has not been included in an approved budget and financial plan or in the Fiscal Year 2007 Budget Request Act of 2006."