There are a lot of markets with solid job markets, strong populations, solid rent growth, but when you are talking ONE property, unless you are considering highly rural areas, it likely doesn't matter.  

How strong is the demand for mid-term in Denver?

The White House area might appeal to families or professionals wanting to live near Nashville at a lower cost.If you're open to exploring other markets, Memphis, TN also offers strong rental investment opportunities.

Some of the best opportunities can be found in other regions, particularly in markets known for strong rental performance, stable property values, and tenant demand.

Naturally, I assumed REI’s "white-glove" service included a strong legal team to handle these situations efficiently.

Population and economic growth, strong tourism, proximity to other New England cities.

But I strongly urge anyone to always get Aldermanic support before proceeding because it makes life--and the entire project / process--a whole lot easier. :)IN SUM: Based on what you've shared, it sounds like you won't need to rezone if you just want to build a duplex.

As rental rates increase, cash flow becomes strongly positive.  

If you’re set on a duplex with minimal rehab, an investor focused agent should have a strong network of contractors who can give you quick quotes, so you don’t wind up with any pricey surprises.

If you’ve got strong tenant demand, proximity to top employers, or even access to public transit, you’re laying a solid foundation.