The Islamist Challenge to the U.S. Constitution - Self-governing enclaves

Courtesy of Jihad Watch, this article The Islamist Challenge to the U.S. Constitution from the spring 2006 issue of Middle East Quarterly focuses on the issue of self-governing Islamic enclaves in the U.S. While I quickly got lost in the discussion of law applying to this issue, I noted this detail in the second paragraph:

The Gwynnoaks Muslim Residential Development group, for example, has established an informal enclave in Baltimore because, according to John Yahya Cason, director of the Islamic Education and Community Development Initiative, a Baltimore-based Muslim advocacy group, "there was no community in the U.S. that showed the totality of the essential components of Muslim social, economic, and political structure."

Are there similar efforts in the Washington, DC metro area?