The District of Columbia now allows people to leave their DC real estate through a transfer-on-death or TOD deed. TOD deeds, which take effect only when the landowner dies, are an easy and inexpensive way to avoid probate for real estate.
The DC law includes a form that real estate owners can fill out and record (file) with the DC Recorder of Deeds. The legislation, adopting the Uniform Real Property Transfer on Death Act, became effective in November, 2012. You can find the law in Title 19, Chapter 6 of the DC Code.