Main factors were: Tourism growth, city growth (businesses and residents flooding to Nashville) - will ride the appreciation wave long term as the city rapidly grows and expands, and year round tourism - less seasonality.

When she went to the basement, she saw that the water was pouring very rapidly.

That's the kind of talk you'll hear from every get-rich-quick guru on the planet, kind of like "7-Minute Abs" or Hydroxycut weight-loss pills.Just look at what he promises: you don't need to use your own money, you don't need to inspect the properties, you'll spend very little time on the deal, you aren't personally liable for the loans and debt, you'll work less and earn more...This can all be true if you know what you are doing.

It seems a great HVAC guy is really hard to find and worth his weight in gold in Florida. 

A major Coast Guard base is being stood up in N chs on the river, the port facility is booming and expanding rapidly, and N Chs offers some of the only reasonably priced developable RE with short commuting distance of the peninsula, Mount P, and the beaches.

Less headaches, better tenants, more rapid appreciation of rents and more overall profit, less driving… but maybe not as impressive to someone asking how many doors.

But if these Seattle projects will, two years from now after HB1110 rules are in force, appear to have been an ephemeral thing that came and went among a handful of limit-pushing builders,  our development might end up seeming weird (which could impact both buyer appeal & financeability).I know there's no crystal ball and the State rules have been changing rapidly, and might still change further. 

Depending on the business the environment shifts far more rapidly than the housing market—especially online. 

It's true you get a tax deduction for your mortgage, but you also pay taxes on whatever else you decide to do with that money.I would list all of your known investment opportunities, what you think the after tax returns would be, and a risk level 1-5.If paying the mortgage is a clear standout on that list on a risk/reward basis, I would spread out the $60k over a period of time and apply it to principal.You might have other goals like cashflow or reducing risk which might weight towards paydown also.

Think, I have FULL WEIGHT of liability on my shoulders for ANYTHING my agent's do.