The Mill used as the headquarters of the Gradus Group is the former Macclesfield United Methodist Free Church. It was built around 1880 although records for a previous society go back at least to 1856, and converted to a textile mill in 1946. It is built of brick with stone dressings and a Welsh slate roof.
It is a grade II Listed Building and you can see a description and picture here.
Grid reference: SJ9197673208