they have the lowest rent in the complex, are frequently late with their payments, and that should be enough to choose not to renew

fix the stairs, install new heaters, and keep a reserve (or credit line) so you have enough $$ to make important repairs

by the way, it does not sound like much of a fix for the stairs: scrape rusty spots, paint, and for the concrete do this:

1) Use a screwdriver to chip away any flakes or loose concrete.

2) Scour the crack with a wire brush to remove any dirt and debris.

3) Rinse the cracked area using the garden hose.

4) Mix up a small batch of concrete patching compound, available at most hardware stores.

5) Trowel the compound into the crack using a small putty knife.

6) Smooth the surface while the compound is still moist; concrete compounds begin to set up very quickly.

7) Allow the crack repair to dry thoroughly before walking or driving on the surface.

easy as pie, and does not have to look nice