Note: the basement floor is poured concrete, and is uneven in places, where it seems like the soil underneath has washed away and caused the floor to settle in some areas (not a huge concern at this point).I've had a number of contractors and waterproofing companies evaluate the situation and suggest anything from interior water proofing and wall repair (I-beams or carbon fiber straps), to exterior waterproofing and rebuilding the foundation wall.From my research, it doesn't seem that interior waterproofing will solve the problem, and the I-beams are only a temporary fix vs. rebuilding the wall and exterior waterproof.

You can a metal patch with fiber mesh tape over it at HD.

From a construction perspective, I would recommend a Hardiplank siding or its equivalent (fiber cement, etc.) for tenant situations if you are going with traditional siding.

This is where the moral fiber of the sponsor is crucial.

My property had rotting exterior wood siding so we decided to renovate the exterior of the house with fiber cement board as well as install new front door and new wood on the front porch and rear stairs bringing the exterior in line with the other rehabbed properties.  

They also have a fiber optic camera where they take apart the shower fixture and insert the camera and can see behind the walls without tearing them up and can check for leaks.The rate is around 90 an hour for the 2 plumbers doing the test.Each unit the owner said would take about 30 minutes to inspect.If issues need to be corrected and fixed it would take longer.I really want to get these plumbing issues under control.I don't think the fee is that bad but wanted additional input.Had a great gut feeling meeting them just don't want to blow up the budget too much.I asked about the bigger opening toilet bowls to prevent clogging.He stated the bigger opening would help with excessive toilet paper and waste getting stuck but would not stop things such as toys,q-tips,tampons,etc. from clogging the line.So nothing is fool proof.

The "A" properties are already wired for fiber internet, and retrofitting low end properties comes with considerable cost.

The best way I've found to implement this is lease as close to FMV initially which is typically not an issue since I have a nice, newly updated place with lots of creature comforts unusual for my area (A/C, Fiber internet, private fenced yard with lawncare, pets allowed with no fees or pet rent, completely remodeled interior (1950s original construction).

The property is an old farmhouse the seller has completely rehabbed it himself (gutted & added new spray insulation, new electric, all new plumbing, fresh sheet rock & paint, all new windows (cheaper Andersons double pane), brand new fiber-cement siding, 13 yr old shingles, appliances approx 5 yrs old (beautiful stainless in lower unit).

If your 5 houses already have services (water, sewer, elec, gas, fiber) you might see what the cost is to run those services to the new lots.