The Antiquities and Monuments Office (AMO) has commissioned Purcell Miller Tritton LLP, a British firm of conservation architects, to conduct a consultancy study 'Historical and Architectural Appraisal of the Central Government Offices'. The study, conducted by Mr Michael Morrison, was completed in September 2009.

Purcell Miller Tritton LLP is one of the leading firms of architects and historic building consultants in the United Kingdom. It has undertaken conservation work for famous historic sites including the British Museum and the University of Oxford and the practice is appointed Conservation Adviser to The Crown Estate. It has also been commissioned by the Hong Kong Jockey Club to undertake a research into the history of the Central Police Station (CPS) Compound and prepare a Conservation Management Plan.