It could just be settling over the years; however, if your inspector says it's a big concern, you could always ask for a GC or someone that specializes in crack repair (if its the foundation) out there at the same time as the electrician.I typically recommend that the buyer do the repairs, so you can hire someone you trust and can call back.

Also, title listed the property as a 4-unit with only 1 structure, but it's actually a 5 unit with 2 structures, which is another thing that has me concerned.

Quote from @Terrell Garren: This caused me concern in the HUD lease addendum. 5.d.

The TOPA issue caused multiple contracts to fall apart as the tantants tried to hold out for payment, then we eventually were the 4th contract to come in on it and wait them out.

We're looking at a just under 7% rate, no points, with one free rate reduction within the first year (cause rates are doing down, right?!?!)

Example: if you let emotions get in the way when you underwrote the deal the first time, causing you to overestimate the ARV and underestimate the rehab, then it's very possible this happens again in analyzing what the property should rent for.

Anyone else notice the same thing and think this may be the root cause of Wendy's pain?

This is already more than halfway to the 2.6-3.0" where cracks will form and the foundation may become a serious issue that requires expensive foundational repairs or the demolition of the entire property as it continues to get worse and worse.Depending on your contract, it can be cause for you to get your down payment/earnest money back.

Document everything and if you can prove harm was caused by their action or inaction; that puts you in a better position to have them respond. 

I will be researching other STR forms, but my main concern is about liability just in general for no specific reason, as the property is in excellent condition.