Also searched as: Grade A, Grade B office, office grade, Grade A building
Hotels are graded by a rigid star system with set rules. Offices are not. Grade B is good, older and cheaper: a secondary district, smaller or awkward floors, slower lifts, fewer amenities. A grade is not for life: a tower built to a high specification holds Grade A for longer, and one built to the minimum slips to Grade B sooner. A refurbishment can restore the grade, but location, ceiling height, floor plate and structure cannot be refurbished in. The BCO, the British Council for Offices, puts a Grade A ceiling at about 2.6 to 2.75 m in the UK.
This explains the general case. If Grade A office has come up in a live deal of yours, talk to the team: specific answers, registered numbers, no obligation.