Any DD you want to do, inspections, code enforcement lookup etc you're welcome to do but there are no contingencies so once you go UC you buy or lose the $5K. 

I second Stuarts comments 80 a foot I only see in starter sfrs built to minimum ubc code in TX or Al  areas of the country.. in our Oregon market these type of buildings would run 250 a foot to build  IE a MF .. condo basically the same..

Every property is so different and the various codes and regulations are different as well.

or zip codes?

A reasonably good source is AVVO.com by zip code and expertise.  

This home was located in a zip code that is notorious for its ultra-modern design (though those homes are still sitting for sale).

The code being cited by the inspector is below if you care to bother.Thank you.https://codes.iccsafe.org/content/IPC2021P3/chapter-7-sanitary-drainage#IPC2021P3_Ch07_Sec708 Could you put cleanouts within the interior (is there a basement?)

While I'm not sure if this property is in EBR or not, I'm finding the average FMR for 3 BRs for all zip codes in BR is over $1,500.

Use median household income by zip code (and school rankings, to a much lesser extent). 

Yes, our lending partners have sent us a list of zip codes that are affected/been put on hold.