I send her homes that are in semi war zones and multi family.

Red flags pop up immediately for me on that one.

If you go on Zillow or the MLS and notice that there haven't been any sales within the past 12 months, this is a huge red flag and indicator that you should pass on the home.

I am SEVERELY limited in my choices of where I can relocate and this would have worked (zoning and all are ALL fine, just not these damn CCRs). 

Then there's always the chance that the zoning, if to be placed on private lo/parcel  may prohibit homes beyond a certain age and if its going to be installed in a MHC the manage may not allow anything older than 10 years. 

@Robert Swingle - This is a local zoning question.  

They are non-conforming with the current zoning but are grandfathered. 

I have a property that could be used as a private residence and is zoned industrial.

Many folks may need a place very soon or like now (pronto) not when the construction wraps up, so that could cause a pause.Plus, for many (unless they are HGTV fans or in the trades) they will simply see a construction zone and not a future home (even if you are almost done)....

Also this past summer we had a devestating flood which basically rewrote our flood zone maps for the area.