Take pictures and or videos of the place. 

I have a friend that is a very professional and hard working.

Professionals drill (two feet or the longest masonry bit available) into the hole every 24 inches around the exterior and interior (if the basement is not finished) perimeter of the building and spray the chemical into the hole.After you have sprayed the chemical in the hole patch the hole with cement so the rain doesn't flush the chemical out.

http://www.dce.harvard.edu/professional/blog/how-u...

It is also great that your wife is into real estate investing.Y'all ought to form some sort of corporation or an LLC after you get some professional help from a CPA and\or an Attorney.  

Future readers/do-it-yourselfers- leave the popcorn ceilings to a professional.

@Brandon Vu  it really sounds like you should sit down with an experienced real estate professional and ask all your questions. 

Be professional, friendly, but firm.

-Professional management w/1 full time manager and 1 full time maintenance tech-Plan:  Full exterior rehab, renovate all down/vacant units, move office from TWO units that are currently being used to the abandoned dedicated office that is down to the studs.  

One is online 24x7 like BP and youtube videos and another essential facet is belonging to a few local REIAs at the same time.