Tenants and maintanence have access to the roof. It's a flat roof so they might go up there for the view, a smoke or to retrieve storage. I looked up and someone there once. I looked down at night and its like looking into a fishbowl, - perfect view.
More details: The ceiling has a dome structure leading up to this pyramid window - about 12 feet across.
I thought about installing a horizontal roller blind with some sort of eye loop on one side and a fixed hook on the other side - and pulling it across with a hooked pole. I'd prefer a cool R/C solution though.