How about something like this for a SF fix/flip: https://www.realtor.com/realestateandhomes-detail/325-W-Sain...?

The most important step to avoid a catastrophe is to create a detailed contract with your contractor.

Bryson, welcome to the BP Forum and thank you for all of the details!

These methods include: Detailed Engineering Cost ApproachDetailed Engineering Cost Estimate ApproachSurvey or Letter ApproachResidual Estimation ApproachSampling or Modeling ApproachExperience or “Rule of Thumb” ApproachIt’s important to understand the differences between the approaches including which one best fits your property and the reliability of each approach.DETAILED ENGINEERING COST APPROACHThis approach compiles the costs from construction and accounting reports to build a report.

@henry Clark has posted on BP exact detailed steps to create a self storage facility.  

Here’s the details.  

What I personally do is I will hire a local Civil engineer who has done subdivisions in the jurisdiction and I will pay them up front for a detailed feasibility study.

Oh wow, absolutely love all of these tips and details!

Points and loan details are TBD still as we're just getting the tentative process down on paper as we wade into the details. 

Reports must include details of beneficial owners, such as names, birthdates, addresses, and ID documents.