They might be open to removing the vehicles.

Unrelated to HOA but if homes won't pass the safety engineered designation, who demo's house and haul off and when does HOA or city make owner to remove?

I should have put my foot down 12 months ago about removing it but I let it go.

Giving up a guaranteed increase in value with them using their own capital to increase the square footage would seem like a no brainer, but how much are you losing if you remove the drive thru and can't put it back.I would talk to commercial brokers and other owners in your area to see the value of a drive thru.

We're currently paying for lawn care, snow removal and cleaning services + husband is doing some of their home maintenance himself.

No one to refer, but when considering a blanket loan make sure to understand the how the loan would treat removing collateral from the pool.

All knob and tube has been removed from property. 

NEW TENANT GIFTSHere's what we give new tenants.....Cleaning Bucket with Cleaning Supplies:white vinegar, baking soda, awesome degreaser, disinfectant wipes, carpet spot cleaner, magic eraser, all purpose cleaner, scrub sponge.Tote Bag with Useful Items and Tools:hand soap, paper towels, plastic garbage bags, toilet paper, toilet plunger, Zip-It (strip for clearing hair clogs from drains), plastic clothes hangers (6), shower curtain liner (good quality cloth one), laundry detergent, dish soap/dish detergent, cutting board, "Freeze the Grease, Save the Drain" kit, “Recycle” bag for collecting materials for recyling, magnet with our name and contact information, picture hangers.Refreshments In the Fridge (for move-in day): several bottles of water, healthy snacks, bottle of sparking cider with a welcome note attached.Larger items: Welcome mat, shoe tray.

I am obligated to remove my ex from the mortgage by refinancing or selling the house by next July.

If the other tenant is the one creating the unsafe situation, then you are legally allowed to remove them.But I wouldn't take any steps unless the tenants asked you to get involved.