I had a vertical crack in my basement, all along the height of the wall, and it had started to lean in on one side, so the crack was no longer flush.

Renovation financing of existing structures to meet current guidelines will likely be the better bet while this all gets flushed out.

While lots goes into the analysis for a Mobile Home Park (for which I am less versed - due diligence will flush those issues out) this much I do know. 

take care of the water heater (flush it, change the anode rod) and it will be good for years.  

If it's a clogged toilet, pictures won't help and are completely unnecessary: either the toilet flushes or it doesn't.If an owner asked to inspect their property, I try to accommodate them but I require them to give reasonable notice to my staff so that we have time to schedule it with our office and the tenant.

If I did that for six months I'd basically be flushing my marriage down the toilet bowl.

Now multiply that by X mobile homes, all of them flushing things they shouldn't be flushing, and that's that.

Also, install the glass block flush with the tile so there is no ledge on the inside...that will prevent water from getting into the wall ever again.

Multiply that by the fact that if you don't put 20% down you will be paying PMI or MPI, which is the equivalent of flushing money down the toilet only to clog your septic system.

tape seams with good fiberglass tape then mud them and any sunk fasteners (supposed to lie flush) and start tiling.