Biggest block I see for REI investors starting out is the shinny penny. 

We went through top to bottom added a bath and finished off the unfinished basement.When we went through the house before purchase we noticed a duct taped toilet flange in the concrete slab that was still set up from the original pressure test. also a stub out for the lavatory sink.

Across the street from it, there are blocks and blocks of class-C buildings which were built in the 60s and 70s.

Is the ceiling concrete or drywall?

This was a few blocks from the main walking street of shops and restaurants.

I bought two mfh buildings BY MYSELF in a reasonable tourist town and live within a block of each.

@Marcus ParasThis is usually on my “avoid” zip list but I think looking at the specific area, down to the block, is really important.

I've seen (probably you have too) the non-HOA duplexes or fourplexes that are overrun by weeds and the siding is peeling and there is trash in the yard or maybe a car up on blocks...

So they will often under appraise initially.Memphis has war zones next to mansions so a couple of low sales can pull down n entire block.  

I think the carriers that have something that will address serious settling issues refer to the coverage as catastrophic event coverage.Are you seeing actual signs of settlement such as cracks around door and window frames, offset concrete block at a foundation etc, or are you just wanting the coverage for peace of mind?