But one of my verticals is not a lead source you can just Google, go to their website and purchase, like you can with, say Probate, Tax Delinquent, or Pre-foreclosures.

I've thought about just searching the deceased name on the county assessors website hoping to pull an address and then sending a letter to the executor.

We both want to sell the property as soon as it is finished.

If you are going to leverage it and get any financing, traditional  lenders like to see 6 months PITI in the bank for each property.When I acquire a property I plan to finish in the first 6 months any costs to rehab or improve the property.

He started renovating it, but did not finish, and bought a house and is moving out in a few weeks.

My client, the potential buyer would like an estimate to finish the home and complete the construction.

The information is publicly available on county tax auditor websites. 

A great place to educate yourself is the SFMTA website where all the projects they are currently working on are listed.https://www.sfmta.com/projectsThe other way you could speculate is by following sheer density, such as Mission Bay or Potrero Hill where there are a lot of new developments going up - almost endlessly.

The instruction sheet will tell you which models can be interconnected, and you can often get that sheet as a PDF from the manufacturer's web site before you buy.I've also seen a suggestion to make sure that wired smoke alarms are powered from a circuit that also has a light on it that is used relatively often - like the light over the stairs, or the front porch light, or similar. 

Around here about $90 to $100 a square depending on finishes and complexity of design, which would include driveway, septic system, and no landscaping