Vacant lot parcel combined with SFR parcel

[Pandu Chimata]

Hello team, I am in the process of exploring a potential investment for a potential flip. The property I plan to purchase has two parcels.

One parcel, 0.18 Acres, has an address assigned to it. A SFR was built in 1947 and required renovation.

The 2nd parcel, which is right next to it, is an vacant land, no address associated to it.

My initial thoughts are:

1.Purchase this property and rent the house after minimum required updates 

2. Build mobile home on the vacant lot 

I understand the cost involved for rehab the existing house.  I don't have any idea what it will cost roughly to make the other lot as a living space - right from assigning address, brining in utilities,  plans for the mobile home (3 bed and 2 bath) install, etc. I know this city allows mobile homes installation with permanent foundation. 

This is in riverside county, in CA. Any wild idea that how much it will cost to make the vacant lot to a living space?