RTC §65: (a) The creation, transfer, or termination of any joint tenancy is a change in ownership except as provided in this section, Section 62, and Section 63.

(a) The creation, transfer, or termination of any joint tenancy is a change in ownership except as provided in this section, Section 62, and Section 63. Upon a change in ownership of a joint tenancy interest only the interest or portion which is thereby transferred from one owner to another owner shall be reappraised. (b) There shall be no change in ownership upon the creation or transfer of a joint tenancy interest if the transferor or transferors, after such creation or transfer, are among the joint tenants. Upon the creation of a joint tenancy interest described in this subdivision, the transferor or transferors shall be the “original transferor or transferors” for purposes of determining the property to be reappraised on subsequent transfers. The spouses of original transferors shall also be considered original transferors within the meaning of this section. (c) Upon the termination of an interest in any joint tenancy described in subdivision (b), the entire portion of the property held by the original transferor or transferors prior to the creation of the joint tenancy shall be reappraised unless it vests, in whole or in part, in any remaining original transferor, in which case there shall be no reappraisal. Upon the termination of the interest of the last surviving original transferor, there shall be a reappraisal of the interest then transferred and all other interests in the properties held by all original transferors which were previously excluded from reappraisal pursuant to this section. (d) Upon the termination of an interest held by other than the original transferor in any joint tenancy described in subdivision (b), there shall be no reappraisal if the entire interest is transferred either to an original transferor or to all remaining joint tenants, provided that one of the remaining joint tenants is an original transferor. (e) For purposes of this section, for joint tenancies created on or before March 1, 1975, it shall be rebuttably presumed that each joint tenant holding an interest in property as of March 1, 1975, shall be an “original transferor.” This presumption is not applicable to joint tenancies created after March 1, 1975.