[pavel_lishin]

Unless rents are going up - in which case, a renter moving out means you can charge the next person enough to cover the apartment sitting empty for a month.

(That's assuming apartments even stay empty that long; when we were searching, we almost always had to commit to an apartment the day of the showing, or it'd be off the market the next day. Apartments seem to stay empty long enough for the required cleaning and maintenance to take place - and sometimes barely even that long, we've viewed apartments that were being actively worked on.)