For plumbing/HVAC I use Mat's Mechanical exclusively (water heaters, furnace trouble shooting, etc). 

Hi @Mat Kik.  

:https://www.biggerpockets.com/forums/52/topics/680...Without providing a laundry list, I think the theme is to tackle the wear points and troubleshoot the individual unit.For example, start at the door (door mat to catch debris, good functioning new lock, perfect close and open, door stop) and work through each room with that level of detail ( example: Bathroom: new shower curtain, bath mat, caulk, new toilet flapper or overhaul kit inside, strong towel bars, etc.)I would focus first on the low cost items that can prevent larger problems (your doorstop type theme) and then also evaluate any larger item close to the end of its useful life, especially if showing signs of problems (be it hot water heater, worn flooring, or an appliance). 

And expansive soils are not known etc etc.and as long as you have earthquake straps your good to go

If it is still not sold in a month are they expecting me to get their place on place mats at the local diner and a postcard campaign to the local apartment complexes, hoping that someone who didn't realize they were ready to buy will bite.

I am still recovering and cannot walk and that mat have a bunch to do with my opinion.  

You'll find both Mark Kohler and Mat Sorensen mentioned here on BP.

There Is Still Money To Be Made In 'Mobile Homes' In Today's inventory strapped San Diego Coastal real estate marketI am frequently asked if the market is still ripe for investing in old "Mobile Homes".

We now rent the two family for 875 up, and 725 down. expenses on the house are about $850/m(mortgage, taxes, maintenance)My question, or thought is, we are strapped for cash right now because of the new home and renovations, but i really want to get another multiunit.

I told them I would work with them and it wouldn't be a problem, but then they refused to give me a move out day/time, decided not to pay rent January 1st, and then stopped responding to me until I got a text that said the key was under the door mat.