Casey Trees, the DC organization committed to protecting and renewing the city's tree canopy, will be moving to Brookland [pdf] in late 2008:
...Next year [Casey Trees] is moving from 1425 K Street downtown to the Brookland neighborhood at 3030 12th Street and Irving. The group plans to renovate and add to the existing 4000 square foot structure to house a staff that is expected to grow from 20 to 30-35 people over the next 15 years.
“Our central downtown location has been great, but as we’ve grown our need to be based within a neighborhood where we can work hand in hand with our network of community members has increased. We’re looking forward to putting down our own roots as an organization to join the roots of the trees we’ve planted with our volunteers over the past six years” said Mark Buscaino, Casey Trees Executive Director.
Casey Trees has retained Smith Group as its architects who are now working on concepts. Initial thoughts about the building’s construction are for it to be as “green” as possible, incorporating trees, low-impact development stormwater control features, possibly a green roof, and other elements.
You can read Washington Business Journal's article here [pdf].