There are three interesting aspects to what happened in Maryland, and DC. First, around a decade ago.....Maryland sought to raise income tax levels on the ultra rich in their state. Within the first year, it was noted that various people were looking at the taxation and moving either to Delaware, Penn, or DC. As far as I know....that trend has never diminished. Once you reach a certain level of income...while you may have a particular business you enjoy...living in Maryland is probably not an option.
Second, the NE and SE of the District is changing. The low-income status of the areas is lessening, with townhouses being erected, and the city providing increased police activity. This is especially true around the Nationals ball park.
Third, there’s simply a lot of upper class people with lifestyles that require the spending of money and consumption of cash. This is especially true around Alexandria, Arlington, Georgetown, Silver Springs, and Fairfax. A smart businessman with an aggressive style...can build onto his wealth very easily.
If it was only a decade ago, how come within 2 years MD GOT the top spot? And took another 8 to lose it?
(psst Silver Spring - singular)