Keep this in mind the next time you find black mold or carpenter ants.Final thought on the owner not doing routine maintenance ... if the house if older than about 20 years then you need to check all the mechanicals (plumbing, electric, HVAC, low voltage) for code, quality and function.  

The gas line for a gas range or the 220 connection for an electric stove were not allowed in the "third" unit.

The land is divided into 24 lots that all have their own septic, electric, water etc. each lot is leased to people who own their own mobile homes and they pay a monthly rent for just the land of $175 (which is a bit under valued should go up to $200) owner takes care of absolutely no maintenance, utilities, structural insurance, etc. 23/24 lots are filled with long term leases in place.

Even so, plumbing, electrical and HVAC work must be performed by licensed tradesmen.  

I have learnt a lot within a week by browsing through the forums in BP.I am a Software Engineer in San Francisco Bay Area, specialized in database technology. 

I've been a licensed broker since 2008 as well, though practicing primarily as an engineer and PM in the biotech industry for my W2.

I am a licensed, bonded, insured Electrical Contractor that moved to the Omaha area after the housing melt down. 20 years experience with about half of it in residential.

I dont have experience with plumbing and electrical which it needs.But lets just say a house with an ARV of 180-190k.

I wanted to ask the BP community in southern California if anyone knows of any good and trustworthy contractors, engineers, or architects that you could refer to help us with this attic conversion?

GENERALLY speaking....If you're doing electrical work or plumbing work, you need to hire a contractor who will pull a permit.