The return of land to the grantor or grant- or’s heirs when the grant is over is BEST described as

A remainder is a future interest granted to a third party — not the original grantor — that takes effect when a prior limited estate ends; for example, 'to A for life, then to B' gives B a remainder, not a reversion.

A kickback is an illegal payment or commission rebate, typically associated with RESPA violations in mortgage and settlement services; it has absolutely no connection to the transfer or return of property interests.

Surrender is the voluntary relinquishment of a leasehold or other lesser estate by the tenant or holder back to the landlord before the term expires; it requires an affirmative act by both parties and is not an automatic legal operation.