This is not a dig at wholesalers, it's the nature of the relationship.  

If you have slop behind it, that's from where most of the water is coming into your backyard - that wall should "capture" it and redirect it on the sides, and eventually, further out along the sides of your house following the natural ground slope (see pictures below).The backyard seems flat - one way or another you'll have to find a way to slope it and move water along.Just my 2¢.

If you don't have $1,250,000 at your disposal you should incorporate a BRRRR that will enable you to build it but it will slow you downs.ORIf you are able to generate $300/property in cashflow per month (after all expenses) - it is doable than every 10 houses will generate you the needed downpayment for another house about every 8 months. 

There are several things you will need to incorporate in the contract including that they name you as an additional insured and their company give you 30 day notice of cancellation. 

With the unpredictable nature of timeshare assessment fees and maintenance fees, I would probably avoid that deal.

@Brian Ellis you would probably have better luck supporting it with a stud wall instead of trying to incorporate it into the block wall as you already have studs sitting against the interior of the block.

The lease had a TBD for the address to send the remainder of the security deposit to My lease agreement states that if the lease is terminated before the natural expiration (such as by an eviction) that a re rent levy would be charged.

Might be time to "Blacklist" that area and let "Nature take it course" as it has done in the past in other areas.This seems like it will devolve the area for investment attractiveness, which will probably drive the property values down to what the local's who live in the properties can afford for themselves to live in, leaving a certain amount of homes and areas as a wasteland of non-kept-up run-down dumpy homes filled with violent residents (further increasing it's spiral downward into a slum).Nothing special about that area. 

By nature of that relative being a veteran and not on active duty anymore, his relative won't be getting "orders" to leave within that year,....therefore....the relative needs to be in the property for at least one year. 

Radon levels fluctuate naturally and high ratings can be caused by severe weather.