First, fix the water drainage issue. the leader pipe should be put into a drainage pipe and brought away from the structure, there is water just dumping down and probably causing some soil erosion, which could effect the slab. make sure all water drains away from the structure. if its concrete, have a Mason take a look at it and see if there is anything he can do with it.

Both the kitchen and bath are exceptionally small, but the bids I've gotten have been around 50k for the kitchen (even with no footprint change) and 30k for the (5x8) bathroom, and there is pretty easy access underneath to both. 

Fee means you own the building with the land underneath it.  

Also would I ever have to do a soil test if the garage was used for a business?

Zoning allows for mobile/manufactured homes as long as there is a concrete foundation to strap it to, unless the manufacturer suggests an alternative way to secure the home.The lot suffers from soil subsidence issues, however, so I'm not even sure that a foundation can be put in (see this thread for more info: "Building on Junk Fill"). 

I can tell you without seeing the property it could have pollution in the soil that could cost a fortune to abate.  

You will see soil in the actual walls.

Survey, soils, environmental (if necessary), various city or county zoning fees & permit fees, address cards, utility disconnects/taps, insurance, storm water, architectural/civil/structural, etc.  

Having done major renovations on many homes, I also understand that , should the sink trap leak, that you don't just put a bucket underneath and ignore it.

I am partnering with a experienced investor and I am learning the business rapidly.Looking forward to getting some deals underneath my belt and end this year 2016 with a bang, lol!!