The site of the monastery was given to the city corporation in 1546, and in the following year the church of the friary became the parish church of a new parish of Christchurch, Newgate Street, also known Christchurch, Greyfriars. The church was destroyed in the Great Fire of London, and replaced by one designed by Sir Christopher Wren. The Wren church was itself destroyed in the Second World War. The spire and some of the walls of the Wren church remain, and the site became a public garden in the 1960s. The site of the monastery is marked by a blue plaque. The Wikipedia page is [1].