As a result , in 1721 , a new deed was issued to a much larger 1,410 acres ( 5.7 km ) .
The property was renamed Belair ( sometimes written as Bel Air ) .
As a result , in 1721 , a new deed was issued to a much larger 1,410 acres ( 5.7 km ) and the property was renamed Belair ( sometimes written as Bel Air ) .