Where Washington, D.C. ranks among nation's most valuable cities

The combined value of Washington, D.C.'s residential real estate is close to the stock market value of Microsoft Corp. That's one takeaway from LendingTree's new ranking of most valuable cities, which compares the country's top 50 metros based on the value of their residential real estate markets. Washington, D.C. ranked No. 5 on the list, with a total value of $826 billion, LendingTree reports. The median home value in the city was $466,000, according to the data. Nearby, Baltimore came in…