Couple of details that would help the community here: what's your estimated value of house "A", the loan balance, and monthly rent?

Welcome to the BiggerPockets Community!  

Hello BP community, My name is Joe Belleville.

@Mary Lopez call 5-10 local community banks or credit unions where the property is located and you’ll find at least one that can work with you.

I see some lenders out there would just pick the "lowest" rate and the client ends up paying more than 1% of the loan amount at their closing costs.Key point is "Lowest" rate does not mean the cheapest rate  I have worked in traditional community banking for over 7 years.

Hi BiggerPockets community!

Hi Armando, welcome to the community! 

I definitely recommend connecting with an STR community in the CO area, because it's great to meet other people doing the same thing and bounce ideas off of one another.

HI BP COMMUNITY!

Quote from @Errol Sadler: Hi BP community,I’ve successfully added a second story to a home in Atlanta and am now exploring whether this is feasible in Fort Lauderdale, FL.