A.
Pursuant to § 459 of the Real Property Tax Law of the State of New York, improvement to any real property used solely for residential purposes as a one-, two- or three-family residence shall be exempt from taxation to the extent of any increase in value attributable to such improvement if such improvement is used for the purpose of facilitating and accommodating the use and accessibility of such real property by:
B.
Any such improvement constructed 10 years prior to the effective date of this article shall be covered by this exemption.