Which preposition to use with gatehouse

of Occurrences 2%

One enters the Hospital by a gate, and, passing through a small court, comes to the great gatehouse of Cardinal Beaufort, consisting of gateway, porter's lodge and great square tower.

before Occurrences 1%

Of courseone entered a place like this on the sonorous clanging of a deep-throated bell that roused the echoes of the whole vast congeries of buildings encircled by the hideous twelve-foot wall, unbroken save by the great gatehouse before which he stood insignificant.

near Occurrences 1%

There is a fine gatehouse near the west end of the church.

Which preposition to use with  gatehouse