The college then leased it to a number of local families over the coming years.[41] By this time Oxford Castle was in a weakened state, with a large crack running down the side of the keep.[42] A map of the castle prepared for Christ Church College in 1615 shows the keep on its mound, St. George's Tower with associated buildings and sections of the curtain wall remaining to the north and south, and the next tower to the south, plus a single remaining tower to the north-east, as well as the Castle Mill and a southern entrance to the castle complex;[43][44] according to this map, by 1615 houses and their gardens had been built up to over half of the Castle Ditch or moat, which appears to still contain water.