They’re using her money to clean and try to get the place rented again by the 1st.

So I'm finding several properties on my local MLS where it looks like a rehabber has purchased a property, did the demo work, cleaned it up, put on new siding, exterior windows, sometimes a new roof, framed out the structure, and now are advertising it for sale at this point.

  $70 for cleaning sounds right.  

Nothing worse than stained carpet and if your place isn't spotlessly clean, you get bad ratings. 

You may want to research the Clean Air Act.

This strategy is generally used with a balloon payment in 3-5 years so that the buyer/tenant has time to clean up their credit and qualify for a mortgage. 

Wil the agreement allow the other side exit cleanly and finish what needs to be done?

4) Does Brian tell us which companies he uses for management and virtual front office and cleaning, etc?

For one of my first deals, im dealing with "subject to" acquisition, holding in a land trust, trying anything and everything i know to find funding for the rehab, cleaning up after straight hoarder tenants, out of state owner, etc.

With s/t rentals, the work may not be too extensive up front, but it is a very demanding business as you either do all the work yourself: filling out the units, cleaning, maintenance, etc. or hire a team to do it all for you, which will of course leave a lower bottom line for you, but it is the only way to scale.