It's not your problem- it's Animal Control's problem.How do you know this isn't a spat between neighbors and the complaining isn't related to pettiness between neighbors (maybe your tenant called the cops on your neighbor for playing loud music and this is the neighbors way of getting even) relating to someone not liking the other for a completely different reason.I'd approach the tenant, mention it in passing, and leave it for animal control to enforce.

Is it coming from neighbour sideIs it Music, animal  etc 

The fallout is, this has given the taxman cause to increase the assessments on those of us not playing this little game.Lately, a few of these "parents" have been left standing when the music stops and the house gets sold to an investor (parent taking a haircut in the process).

I'm one of those guys who likes to take care of the financials, collecting rents, showing properties, etc. sidebut Im not a huge fan of getting stupid calls for small fixes so this would be beneficial Sure, I have friends who like to mix music but don't like to produce it and vice versa.

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.