Joe Koppel try a land trust which works the same but provides more privacy.

I have a locked privacy fence placed between the main house and the in-law suite, and separate yard entrances for them, so I am trying to provide maximum privacy. 

They may or may not give the address (privacy and domestic abuse law issues) but if you give them a letter they may forward it for you.I would also drop something in the doorway or mailbox.

The property has a new bathroom, kitchen, water heater and heating (two years old) he also added a new privacy fence and waterproofed the basement.

I always try to maintain the philosophy that my tenants deserve privacy unless they are damaging the premises and hurting other tenants.I also have regretted whenever I've stuck my nose past that line and tried to give them advice.Domestic violence is a tricky one though because they aren't damaging the premises or (usually) disturbing other tenants.  

@Brandon UprightIt is the privacy laws, not the real estate laws which make it more challenging to systematically find absentee owners.  

I personally use a land trust to hold title which provides me with the privacy protection I need. 

Are the neighbors respectful of my privacy and right to quiet enjoyment - or are they shooting at each other?

There are many, many types of trusts, each drafted with a given set of objectives: privacy, asset protection, tax avoidance, charitable remainder trusts, generation skipping trusts, beach bum trusts, etc.Also, you need to be very specific as to the taxable events.

I think tenants would find the privacy appealing.Please feel free to weigh in...