You asked

I would like to know how many buildings which are owned, leased or otherwise previously occupied by government departments (or their associated organisations) which are now vacant. Please detail these by London boroughs, with indication of their size and viability (in terms of connected services and facilities, or the possibility of having these easily connected - I understand that some of these may have been terminated whilst not occupied). In addition, as a summary, can you please confirm the number of empty buildings in each UK nation.

We said

Thank you for your request.

Unfortunately, we do not hold the information you have requested.

For England, the Office of Government Property may be better place to help you. They can be contacted at ogpsecretariat@cabinetoffice.gov.uk. Please also see the following link, which may be of use to you: ​https://www.gov.uk/government/groups/office-of-government-property-ogp