Many ServiceTechs cover this via a service call fee. 

Here's what I did:Kitchens: Painted cabinets, updated hardware, added efficient appliances.Bathrooms: Installed modern fixtures, used neutral paint.Exterior: Applied fresh paint, improved siding, enhanced landscaping.Results: Property value rose by 100%What budget-friendly strategies have you used?

Brand new mini split AC installed around $1000.

I installed NoiseAware in the common hallway, but convinced that it does not accurately record the volume.

As with any electronic item they can fail, so I keep an extra new lock on site at each property for maintenance to install if needed. 

The cleanout is about 10-15 feet from the curb, but they had to snake 70 feet, suggesting a potential city sewer issue.The plumber mentioned that if I report this to the city, they will likely request a secondary cleanout closer to the curb, which I would have to install at my expense (a costly job).

They’re easy to install and, while not perfect, they’ll make a noticeable difference.

I would set the cleaning fee for at least what it costs If you feel the cleaning fee is high get some other quotes 

If they can't do that, keep shopping.This may require digging up the foundation, sealing it from the outside, and installing a french drain to keep water away from the walls.

You're local to me.There's a couple ways to go at this ;If you're looking to save some money you can have your plumber install sub-meters after the individual meters.