I’m sure they aren’t advisable on larger projects but depending on the project size and complexity, they worked great for me. ~$650 for the study. 

You can't sell a portion of a property like you can sell portions of stocks, bonds, mutual funds, etc.

If it doesn't then I would give the previous owner their portion.

While the IRS does not mandate a physical site visit, the IRS cost segregation audit technique guide (ATG) does suggest conducting “field inspections.”It’s important to note that the ATG is not an official IRS document.It serves as a guide and cannot be used, cited, or relied upon as an authoritative source.However, the recommendations in the ATG are worth considering.According to the guide: “A field inspection is recommended to document the physical details of the building, type of construction, materials used for construction, the assets contained in the building, the size and types of building systems, and any land improvements that were included in the purchase of the property and the condition of that property at the time of purchase.”So while the IRS does not require a site visit for cost segregation studies, following the guidance from the cost segregation audit technique guide can be beneficial.

We just bring over our full size Bissel and clean the carpets along with full cleaning top to bottom.So far so good!

If you're situ was Seattle, a good portion of them would be vagrants.

Is 1.3 usually what you see with those smaller private sized projects?

Never a one size fits all solution to an asset protection strategy.  

Seller is selling a portion of a 20 acre lot that has not been parceled yet.

The housing authority also came out after I told them nobody is living there anymore, so they removed her from the section 8 program and they no longer pay a portion of the rent.