(a) At the time of the first conveyance of each unit, except by foreclosure or deed in lieu thereof, or from the declarant in which conveyance the rights and obligations of the declarant are assumed, every mortgage and other lien, except such as are not yet due and payable as permitted by subsection (d) of section 47-70 , affecting such unit, including the percentage of undivided interest of the unit in the common elements, shall be paid and satisfied of record, or the unit being conveyed and its percentage of undivided interest in the common elements shall be released therefrom by recorded partial release.
(b) The grantee of a unit shall be jointly and severally liable with the grantor for all unpaid assessments against the latter for his share of the common expenses up to the time of the grant or conveyance, without prejudice to the grantee's right to recover from the grantor the amounts paid by the grantee therefor. Any such grantee shall be entitled to a statement from the unit owners' association setting forth the amount of such unpaid assessments against the grantor, and such grantee shall not be liable for, nor shall the unit conveyed be subject to a lien for, any unpaid assessments against the grantor in excess of the amount therein set forth.