Maryland Code, Real Property § 12-102

(1) If the plaintiff lawfully is authorized to take the property before trial pursuant to Article III of the Maryland Constitution, or any amendment to it, and the required payment has been made to the defendant or into court, any required security has been given, and the plaintiff has taken possession of the property and actually and lawfully appropriated it to the public purposes of the plaintiff.

(2) In every other case, if the plaintiff pays the judgment and costs pursuant to Title 12, Chapter 200 of the Maryland Rules.