City of London Serviced Offices by Monument. The Monument Street flexible office space for rent is located opposite Sir Christopher Wren’s Monument, built to commemorate the great fire of London. The building is minutes away from London Bridge mainline station and opposite Monument tube station. Also nearby are Fenchurch Street and Cannon Street mainline stations, and the famous Leadenhall market and Tower of London. The area is serviced by many bus routes and also benefits from being a short walk from Tower pier ferry terminal.