office block 
noun British
A large multistorey building containing the offices of one or more companies: modern high-rise office blocks...
- A new council-wide call centre would be created in the Black Box municipal offices and an office block and new shops built in the town centre.
- Down the street there is a Montessori School housed in an office block.
- Its two storeys house a mini-market and seven shops plus a four-storey office block and visitor centre.