Here are some links we find to be helpful:

THE EVERGREEN FAMILY
Evergreen Properties – Quality Real Estate Agents

MARYLAND GOVERNMENT AND INDUSTRY

Maryland Land Title Association
Maryland Department of Assets and Taxation (SDAT)
Chicago Title Insurance Company (Fidelity/Ticor/Commonwealth)
Maryland State Bar Association
Judicial Case Search
State withholding for Non-Maryland Sellers
Washinton Suburban Sanitary Commission (WSSC)​

VIRGINIA GOVERNMENT AND INDUSTRY

Virginia Land Title Association
Virginia Department of Taxation
Chicago Title Insurance Company (Fidelity/Ticor/Commonwealth)
Virginia State Bar Association
Virginia State Corporation Commission

OTHER USEFUL LINKS

Zillow.com – estimate the value of a property
Martindale.com – find a lawyer
Wikipedia – Description of Title Insurance

DC GOVERNMENT AND INDUSTRY

DC Land Title Association
Chicago Title Insurance Company (Fidelity/Ticor/Commonwealth)
DC Bar Association
Real Property Assessment Database
District of Columbia web site
DC Water and Sewer

FEDERAL LINKS

Internal Revenue Service
US Department of Housing and Urban Development (HUD)
Public Access to Court Electronic Records (PACER)
1031 Exchange
FIRPTA withholding for Foreign Sellers