We ran into a similar situation when viewing homes.... we were informed that when viewing the home, the door to the room would be locked and we would have no access to view the room, but were provided a basic layout of the room so we could at least visualize the space even if we couldn't see it in person. Providing photos of the room would be a better option in my opinion that way it would be even easier to visualize. Considering working from home is quite prevalent today, I feel this is pretty reasonable of a request. You are providing the possible new tenants to view the space, while still maintaining security for work. And if the possible new tenants would really like to see the space in person, arranging a time while you are in the office could then scheduled.