and what about you, are you isolating yourself? 

To simply let people utilize our buildings to self isolate for free during these times is absolutely ludicrous.

Being so isolated, are there now jobs that are supporting the tenants sources of income?

Isolate work areas from living areas with plastic sheeting.

HUD does not isolate and identify any issues

To make a long story short: Our tenants reported that the main circuit breaker has been tripping with some frequency, so we brought an electrician out today.He isolated the problem: romex wiring outside the house going to the central A/C unit.

Looking at the unit I own in isolation, the "math" works, given the net monthly cash flows relative to expenses are still net positive.

A vacant inherited house, by itself, is a sleepy list unless you are sufficiently skilled to isolate and stimulate their pain.You need better lists which target people with big, in-their-face problems. 

IF you know how we could find or better tune our search to isolate builders that would be wonderful!

However, I'm currently in the military at a VERY isolated location so I don't really have the opportunity to check out the local market (nor am I really interested in buying up here).