Exterior signage for an office depends on who owns the building. An owner-occupied building can carry the company name high on the wall, on a monument at the drive and over the main entrance, within the city's sign code. In a multi-tenant building, the owner usually reserves the facade, and a tenant's sign rights are written into the lease, sometimes tied to how much space it occupies.
Where exterior signs are possible, scale matters. Letters high on a building are read from a highway or the far side of a business park, so they are sized for that distance and mounted with attachment details prepared for the wall. A monument at the entry drive, with the street address, helps visitors confirm the turn.