Downstairs is empty and can be fixed up really nice for $30k (new electrical, skim coat walls and paint, new doors, new bathroom and kitchen, new windows-old windows are ok).

The downstairs of the house could be one unit probably earning $850 per month and the upstairs could be a separate unit (it has a separate kitchen, bath, 1 bath and living) for $550 per month.

Sounds easy....But, right now the house is just a large single family property with a bunch of rooms, bathrooms and an extra kitchen.

The villa is over 6000 sf bua, comprising a main villa with staff kitchen, lounge areas, 5 guest suites, outdoor restaurant area, a large veranda overlooking the sea, a pool, and a second villa with staff accommodation and a further 4 guest suites.

A lot will depend on the type of construction and design you go with as well as your building footprint for 30 units, number of stories, site topography, parking layout and utilities etc. 

I currently have several properties that need pretty substantial rehabbing (full kitchen/bath remodels, added a 3rd BR/Bath to 1 property).

That's a computer program designed to review comparable properties in the location by a variety of factors in order to determine what the value is.

In fact generally an appraiser will have no idea of the difference as there really isn't one.Financing as well will treat your home no different then a stick build, generally there is no variation available between stick & modular appraisals, financing, or real estate agents forms and processes.This is assuming that what you are looking at is a modular and not a mobile or manufactured home.Some of the early modular's had poor designs and looked like a mobile home down to the paneling in the walls.

A well designed solar system is designed to offset 100% of your usage based on previous 12 months' usage and conversation about future usage such as intent to buy an electric car, etc.A relatively small bill with the utility will always be there as there is a connection fee for the privilege of being attached to the grid.

It's all about the loan company wants to cover their a... so they do an inspection.When you have a simple kitchen sink without a faucet it will not pass inspection lots of small issues will cause it to fail.