Adding a response here in case anyone stumbles across this thread in the future.

Finished basement with an added bedroom and enclosed laundry area.

I can add value to RE by adding a bathroom, renovating the kitchen, ADU, etc.

Let's eliminate credit screening.Where's all the private landlords?

In the end, I added a ton of value by turning a headache into a dream home.

Turning on the fan will also help eliminate bathroom odors and odors from harmful bathroom cleaning chemicals.Pro tip: Add cleaning the exhaust fan on your cleaning crew’s checklist during turnover.

However, I should note that this tenant has been late paying rent several times recently, which has added some strain to the landlord-tenant relationship.How would you approach this situation?

The fact that you already have multiple units fully rented is a big plus.If I were analyzing this, I’d start by verifying each cottage’s rental history, condition, and potential for adding more units or amenities.

Echoing some of the comments from others on this thread and adding that the LLC is purely for asset protection and limiting your personal liability. 

Aaron I would not pay but if they wanted to have this added I would have a licensed electrician perform the work.