It depends on the unit Lilly.
400 Mass Ave #1201 is a 1 bed 1 bath listed at $475,000.
475 K St #522 is a 1 bed 1 bath listed at $439,750.
In the past year, 15 units have sold at 400 Mass with the average being a 1 bed for $485,591. At 475 K, the average unit (out of their 15) is a 2 bed 2 bath for $490,557, so actually you get more on K than Mass.
Are you interested in either of this buildings? If so, I'd love to get you in the door!