Les Wrote:
-------------------------------------------------------
> Everytime there's a national recession, the
> government (and government contractors) are at the
> front of the line getting the stimulus. Federal
> discretionary spending rose dramatically during
> the three recessions under Reagan (1982-1984),
> Bush2 (2002-2004), and Bush2-Obama (2008-2010).
Not just that, but this area has also been wooing high-value white collar workers for a while now. Check out this list of companies whose headquarters are in Northern Virginia.
http://en.wikipedia.org/wiki/List_of_companies_headquartered_in_Northern_Virginia
Now combine that with other high-tech companies with substantial installations in NoVA, along with more of the same going on in Metro MD (more focused on biotech firms though) and the large military, contractor, and government footprint in the area and the result is a lot of highly paid professionals taking the area over. Demand for housing and services skyrocketed, and the professionals could pay the ever increasing prices. The rising cost-of-living forced companies to increase salaries in order to draw in new employees or convince existing employees to transfer. The higher wages, in turn, drove up demand which, in turn, drove up the cost of living. Contine the cycle for thirty years and you end up with an expensive workforce living in an expensive area - service professionals end up being priced out of the market.
So, to answer OP's question, it's been a transitioning process for years. I can't point to a specific date when the switchover occurred, but it's definitely happened.