1- Tenants not up keeping the exterior of the building  (leaving things in the yard, not picking up trash)2- Tenants playing music too loudly. 3- Not receiving rents on the 1st of the month - this isn't really a pain though, just something I wish they would work on.

The house next door is also a rental and that tenants plays his music very loud at times which greatly disturbs my tenants.

Are you looking to be near a sports venue, high-end restaurants, music scene, suburbia, hiking, water etc? 

When I visited I liked LoDo and the area around the Fillmore and other live music venues.  

You get music and you wait.

@Kelly WiggsHi Kelly,Class C, I'd go carpet.If it were mine I'd go with the most sound deadening pet proof carpet pad I could find, and since you control the Bar, set a Max DB noise level for music 24/7 in the lease and make it pretty low.

No smoking in the house, maybe not even outside, no loud music (I added no Rap or Metal), minimal phones...You have to be the leader and make them respect you.

@Ilya Schwartz One of the best things you can do is reach out to a local music rehearsal space and try to get them to go there.

The guy in the garage unit plays music and smokes weed so some people like to hang out there.I personally like that there isn't a hangout spot. 

There is also royalty-based financing, for example for oil & gas or music royalties.