So while our syndications are going down in flames (well, more of an engine out) we are currently investing in a new fund and are still convinced this is a viable investing plan.

At that time, my net worth was pretty low, and as an engineer my income wasn't substantial either so did not make more than 200k/year.

This was a seller-financed transaction, the terms allowed us to use the ground as collateral and I brought partners in after I got all of the city approvals, and they took over the future expenses for the seller financing note and the other costs like engineering.

I was ignored by the first mortgage company when requesting the initial payments for the architect/engineer and permits for a month, and then ignored by the second mortgage company for another month.

Most of the software I use for deals for myself and my clients use an algorithm that will use statistical amounts for replacement based on current costs.

Engineering studyCan I use the one with the biggest value, and gives me the biggest basis?

I've been reading up a bit, consulting with civil engineers, and contacting the City of San Diego on SB9 but I am by no means a professional.  

We currently both have a day job: he as a firefighter with the City of Austin and myself in the civil engineering (transportation) industry.

Its called Winning the AirBnB Algorithm Game by The STR Insiders.

An additional benefit of a detailed engineering-based Cost Segregation Study is that it can increase potential insurance premium savings as well as provides support for the property tax appeals process.