0001217093-05-000051 4 1 20050519 20050523 20050523 BOSTON PROPERTIES INC 0001037540 6798 042473675 DE 1231 800 BOYLSTON STREET SUITE 400 BOSTON MA 02199 6172363300 800 BOYLSTON STREET SUITE 400 BOSTON MA 02199 LANDIS MITCHELL S 0001217101 4 34 001-13087 05851631 C/O BOSTON PROPERTIES KELLI A DILUGLIO BOSTON MA 02199 4 1 edgar.xml PRIMARY DOCUMENT