The resident tenants upstairs constantly moving due to smelly odors, and noise downstairs late into the night.

Thank you @Jonathan Greene, back to the grind for me

Just have faith in the grind! 

There is also foundation problems, old houses that make noise, etc which makes houses do things by themselves... 

Older houses send noise throughout the house easily. 

This is working with a business instead of a person is a new situation to me, but I rent my home out every summer when I work out of state to regular applicants...I don't want to lose my downstairs tenant that is a great tenant which is a concern as well due to noise from dog etc..I don't rent to applicants with dogs, usually....Guidance please??

I might go that route first so I didn't feel I was being plaid.Get her a white noise generator to hide the ghost sounds.

Lease renewal or not, doing something contrary to lease terms-non payment, noise, smoking and to schedule an inspection.

@Miguel Lopez just keep grinding it out.

Just make sure you find someone who has similar lifestyle as you (noise/cleanliness/etc) - vet them just like you would a normal tenant and interview to get a sense of their personality.3) I purchased in 2015 so prices were lower than now (from a cashflow perspective), so may be harder to attain now, but the other 2 units + 2 parking spaces paid for all the expenses w/approx $400 left over... but I also sacrificed area to get a good deal/income I wanted.