An offer to purchase real estate is terminated by all of the following EXCEPT:

Death of the offeror terminates an offer because agency and contract law hold that an offer is a personal privilege that cannot survive the offeror's death — there is no longer a legal person capable of being bound by the contract if the offeree attempts to accept.

A counteroffer terminates the original offer under the mirror image rule, because the offeree's proposal of different terms constitutes both a rejection of the original offer and a new offer, extinguishing the offeree's power to accept the original terms.

An explicit rejection by the offeree terminates the offer because once the offeree communicates an unwillingness to accept the terms, the offeror is entitled to rely on that rejection and act accordingly — allowing the offeree to later accept after rejecting would create unacceptable uncertainty for offerors.