As a former landlord, and somebody who’s been in that situation, here’s an unethical life pro tip - don’t tell them you’re leaving to buy a new house. Tell them you (and partner if applicable) just lost your job(s), and your hyper specific industry niche as a gerbil pigmentation specialist means you’ll be looking for at least a year. You’d move back into your parents house to save money but you can’t afford to pay the termination fee and the job market is better where the apartment is so you’re going to just stay in the apartment and hope things work out.

Your landlord / property manager is now picturing a 3-12 month late payment / non payment / eviction cycle that will lose them money and be a lot of extra work, and will be very amenable to you just turning over the keys on any day that works for you.