No. 12 Oriel Street, now staircases 19 and 20, is the oldest tenement acquired by the college; known as Kylyngworth's, it was granted to the college in 1392 by Thomas de Lentwardyn, fellow and later provost, having previously been let to William de Daventre, Oriel's fourth provost, in 1367. A back wing to the property was added around 1600 and further work to the front was conducted in 1724–1738. In 1985, funded by a gift from Edgar O'Brien and £10,000 from the Pilgrim Trust, Kylyngworth's was refurbished along with Nos. 10, 9 and 7.