Carpets and wood floors have been recently upgradedExterior of the home is in okay conditionRadiant Heat SystemCool architectural features on door frames, window frames, etcKitchen has not been updated 

Alviso is under sea level and the building codes now require that all new buildings have elevated 1st floors, so I am sure they are in a flood zone. 

I just found out that the oil-tank is actually under the ground floor apartment and the current owner will not allow for soil testing because it would require drilling into the floor in the apartment.

When you start adding floors and kitchens and baths, that price can go up very quickly. 

(This is a weird situation, 1 unit already has gas, and the other uses oil)5) Update new windows (windows are pretty busted but i think it'll look nice with new paint)6) I want to provide GC with floor, cabinets, and vanity I already have one in mind.

Hey Joey, I know of an excellent contractor who has helped me several times with roofing, siding, flooring, Windows, etc...

Most original wood windows need to be replaced, HVAC will need to be installed, both kitchens need updated, all bathrooms can use updates, painting all around, refinishing the original hardwood floors, adding new/nicer carpet in the bedrooms. 

My concern with renting is we put nicer materials in the property than we would have wanted if we were going to rent.IT has new hardwood floors cabinets etc. 

My concern with renting is we put nicer materials in the property than we would have wanted if we were going to rent.IT has new hardwood floors cabinets etc.

Take time to clean dirt, remove nails, spackle and sand, it doesn't take much time to do it right.Hopefully you haven't already done new flooring, if so be sure and protect it.