Any such study is tainted by the fact that Zillow lost an enormous amount of money on their own home buying initiative.

Don't forget cost segregation studies as well. 

What if they build just outside the city limits, so they are not paying city taxes?     

Of course, it's for a limited time only, then they are going to "shut off the Gator Method" for about a year. 

We’ve considered just disclosing and selling as is, but I suspect the buyer pool would be very limited knowing the issues and risks.  

Cozy has been acquired by apartments.com, and will not let me sign up for cozy, and the functions seem limited.

Although we try to limit our Hard Money as much as possible due to the cost.

Ourcurrent approach involves identifying possible contact information for thelisted owners and calling multiple numbers, but this process is time-consumingand yields limited results.

Actually the IRS does not tell us what we can invest in, only what is disallowed (life insurance contracts and collectibles).Allowable investments for SDIRA investing include the following:Residential real estate, including: apartments, single family homes, and duplexesCommercial real estate Undeveloped or raw landREITs (Real Estate Investment Trusts)Real estate notes (mortgages and deeds of trusts)Promissory notes Private limited partnerships, limited liability companies, and C corporationsTax lien certificatesOil and gas investmentsPrivate stock offerings, private placementsJudgments/structured settlementsGold bullion Factoring investments

In fact, a couple of recent studies have shown that working with a broker typically saves about $10,000 on a residential mortgage.