To me it looks like the Three Stooges did it.One trade opens a hole in the wall/foundation to make some repairs, they don't do hole repairs and leave it.Homeowner decides to just leave it, or stack loose rubble bricks back in the hole--thus saving cost of a proper repair job.This is an extreme brick problem: https://www.clickondetroit.com/news/defenders/2020/06/29/detroit-familys-home-collapses-as-landlord-refuses-to-answer-calls/

Return on Investment is 9.6 yrsIf I try to fix it up rear building,  which scares me because I'm having trouble to getting contractors there and i will waste time and money and project won't get done. 

I work heavily with investors and honestly, 70% never buy and do waste our time, however that is the nature of being an agent..doing what others won't because most of the 18,000+ licensed agents (just in Central FL.) are looking for the low hanging fruit and right now, there is plenty of that. 

A month ago one of my tenants in a 3 unit building notified me that they heard a mouse running through their walls and that they believed they were allergic to the dander and had to basically live on Benadryl.

If they are currently on long term lease not set to end anytime soon, you don't want to waste your time with leasing and screening as there is nothing you can do until their lease is up.

Everything on an old house can be upgraded....the hardest thing to do frankly is the insulation in the walls, which needs all the drywall/plaster ripped off to install.

It was a waste of time and energy.

I slept pretty well at night with leveraged rent properties and a wall of good insurance.

I wouldn’t waste my time learning how to do the repairs you just need to know you are being treated fair.

Don't hold the nail square on your chest for the judge to hang you on the courthouse wall and make an example of you.