And get rid of the wet insulation on exterior walls.

The master bedroom was so big that we build a wall separating it into TWO master bedrooms with ensuite baths. 

Long story short, evicted the tenant, put on a new roof, painted the walls, replaced carpeting, added a 1/2 bath, got a new amazing tenant in place (they have since finished the basement, added security alarms, painted walls, added cabinetry... all on their own dime) paying $850 a month.Fast-forward again to last year.

Wait and you may have to do the whole wall. 

The inspector pointed out that where the porch attached so the wall of the house needs flashing. 

Test results positive for Asbestos on walls, and ceiling in kitchen area, and flooring the glue bonding under old vynal tiles, which is covered by carpet den and hallway.

Open it up and run fans and dehumidifiers for about 8-12 weeks and you will start to get to the moisture content levels that allow you to start replacing insulation and closing walls.  

In fact, I've found that one of the worst times to be on the market is the back to school season where the buyers hit a wall and stop looking.

They lived there while we remodelled, moved walls, redid both bathrooms and the kitchen.

Oh, and landlords hate it because it takes extra effort to get the tobacco tar out of the walls too.