Bobby,   I am a licensed broker in NC and I focus only on investment property, so I understand your reasoning.  

I definitely shy away from homes older than 1990, for reasons stated above. 

We agreed to a 3 year lease at the time because they requested it for "stability" reasons.

At least one reason is because sometimes tenants don't pay and the landlord will get stuck with it anyway.  

Sometimes the assessors have no rhyme or reason that is logical.

Hi friends,  purchased my first rental in may this year, got it rented in mid June, signed a 12 month contract with tenant, about a week ago tenant sent me an 'official' email that there is a mice/rat problem, although there were cheaper options I went with professionals who were charging me 7-8x only because this is a long term investment and I wanted to get it solved, the pest professionals sealed the attic and set traps, they followed by couple of times to remove traps and refill bait boxes, my tenant now sent me lease termination letter citing health concerns due to mice/rat problem, they paid for current sept month and said that I can keep half the deposit for Oct.What should I do here, they have three small kids so I understand the reason for concern but I am also doing my best to solve the issue, should I go ahead and accept their termination or should I fight it out, not sure if involving lawyer is good as I am trying to make some cash flow and not lose it.. please advice also I am from Texas and would love to hear about TX law on this.

In a market as hot as Denver, I feel that I could reasonably handle a couple transactions a year in order to pay for the costs of the license upkeep.  

That is the reason I want to contact them is to find out. 

yes  VERY VERY upsettingThis and many other reasons I almost always contact the listing agent and let them get double commission

That was the reason I came to this forum for help.