Category A is usually a standard landlord fit out. This includes features such as mechanical and basic electrical installations, air conditioning, suspended ceilings, uniform office lighting, raised access floors and basic finishes to internal walls.
This ends up to be the finished space that a new tenant would view when the space is put on the market for letting, Habitable yes but a far cry from a functioning working office to suit any new occupant, so very much a blank canvas for turning into the office workplace tailor-made to your own requirements.
In most instances Cat A will not include data points or very much in the way of power but cash sums may have been set aside by the landlord as a contribution towards them for a new perspective tenant so worth asking about that, as well as a floor finishes allowance.
Don’t forget at the end of the lease the landlord will require the space to be reinstated back to the condition it was originally let which will be subject to a schedule of dilapidations in the new lease.