Capital Allowances on a rental property

Client is a company which has bought a house converted into flats which it is letting out.

The client wants to instal a video entryphone system and CCTV around the entrance doors, which seem to be allowable.

However, they also want to instal broadband in the building for which they need a line, distribution points etc. I don't see why this shouldn't be allowable, with the monthly costs as a revenue deduction, but this will also involve access points in the tenants' rooms and I was concerned that this would mean part of the expenditure was within a dwelling house, thus not allowable.