Mount Pleasant Mail Centre ( opened on 30 August 1889) was built on the location of the former Coldbath Fields Jail whose prison gate was incorporated into the building while the rest was demolished in 1929
The original prison gate was incorporated into the Post Office building and not demolished until 1901. The centre was officially opened on 30 August 1889 when the Post Office (Sites) Act (52 & 53 Vict. It was built on the location of the former Coldbath Fields Prison that ceased to function in 1885. The remaining sections of the prison were demolished in 1929, when the new wing was built as an extension to the Letter Office. 
