The landlord’s options include personal service, service by mail, and service by posting notice in a prominent place on the premises.

You should do a google search for 'instrument of service,' which, I would assume is what you got from the architect.

It sounds like the main concerns are noise tenants and small space, which coming from a SFH that can be quite a stark transition. 

Estate plan and advisory services or you want an attorney for drafting documents?  

So I get one the phone and the tech starts telling me the unit is old, and to fix it will require several parts and even then they can’t warranty the work because of the age of the unit etc… I ask him how much and he says, more than $1500 for a new main circuit board and several other parts he needs to price out.

I've also been very tempted to buy into InvestorLift, mainly to seek more Hedge Funds. 

And you can stay there for extended times while still renting the main house out..   

As for my thoughts about the area, it is a good community of with agriculture being its main industry.

Who is responsible for the servicing costs and other costs.

Most professionals will at least talk to you and if they are good will tell you if their services are right for you.