Wise to not just get "as many deals under contract as quickly as possible" when you're starting out - since you'll be holding the bag (and burning bridges) if you can't find a buyer to assign to.

Small things like  "Suite 320" and "# 320" may mean the same thing to you and I but not to search engines, these are the types of things that Yext will point out and allow you the opportunity to fix.I believe the Yext platform is overkill for what you're doing and you could easily pick the top 5 sites to place your business on and fill things out manually.

Would I need an architect/engineer evaluate the property before installation?

In my early 20s I'd been burned by commissions and being steered toward certain funds with higher compensation for the "Adviser," rather than what was best for me.

Plus it has a newer central ac/heat, and it's one of the few in the neighborhood with a real wood burning fireplace.

Get an engineer to do it.

sell the properties - you mentioned being burned out on them, I don't know that a property management company will make it that much better for you.

I would check this with a structural engineer. 

There is a lot in my neighborhood that had a house that burned down in 2007.

I have several people that bring deals to me and I engineer the best win / win deal to make it happen.