Essentially there are various ports in the wall throughout the house and you can plug a vacuum hose into it and it turns on.

@James StewartI have not read your association docs...but condos are usually "walls in". 

All the more reason to retain whatever jobs we can.

There is mouse poop in the refrigerator, holes in the walls, some of the outside wood paneling is covered with a sheet of plywood (maybe it used to be a door?

@Jay Leisten I need someone to do some concrete demo and work on a leaning stone retaining wall does anyone have any referrals

If you're replacing windows, you don't need a permit but if you're putting holes in walls for new windows/doors etc., you need a permit.  

The risk rises the more people do it as most residents don't want to share walls with vacationers, college kids of spring break, etc.

If they are representing a buyer to buy a home, the agent needs to flag a potential mold problem by saying there are dark stains on a wall that should be investigated.In your case, get the "mold" quickly looked at and remediated.

It was a foreclosure where the prior owner allowed it to be trashed - the furnace didn't work so the prior tenants were using a charcoal grill indoors to keep warm (and there was soot on the walls where it was). 

I have seen neighborhoods around the country his brick walls when they were climbing.