Possible Clues:

• Can. province not bordering the U.S
• I.M. with plans
• Designer of D.C.'s L'Enfant Plaza
• It's separated from N.B. by the Northumberland Strait
• Eastern Canadian prov
• Noted architect I.M
• ''Birthplace of Confederation'': Abbr
• Much-honored architect
• Four Seasons Hotel New York architect
• One of the Maritime Provinces (Abbr.)