Their descendants remained in the land (the Israelites were unable to wipe them out completely). Solomon conscripted them for his work crews, and they continue in that role to this very day.
It then went up the Valley of Ben Hinnom to the slope of the Jebusites on the south (that is, Jerusalem), going up to the top of the hill opposite the Valley of Ben Hinnom to the west, which is at the end of the Valley of the Rephaites to the north.
The men of Benjamin, however, did not conquer the Jebusites living in Jerusalem. The Jebusites live with the people of Benjamin in Jerusalem to this very day.