You may want to work with an experienced contractor and/or other experts who have done this in the past.Disclaimer: While I’m a licensed attorney, I’m not your attorney.

Quote from @Trent Reeve: well, a company would have to 50 states and build in integration functionality for 50 different systems.

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.

Start small, build a reserve fund, and work with local experts to ensure your first investment is a solid one.Good luck!

How long did it take to complete those first three builds?

I am hoping this number is extremely conservative given that our contractors, inspector, and realtor walked it as well. 

Insights on cap rates for apartment building in 44313? 

This is very useful.You could build a deck or gazebo to house a hot tub.

Hello Jaycee, CCC is overseeing the horizontal development, provided by our city partnership, and then they will be doing the vertical builds that follow.

Also, grow your contractor lists, maybe make posts about their work.