I live in a condo just outside of Boston, MA. The Condo consists of 6 units. We are self-managed and we have 3 condo board members including myself. We recently discovered that one of the unit owners is renting out her unit. What came as a surprise was that she is renting "rooms". The unit is a 3 bedroom 1 floor dwelling. The owner has installed doors with locking knobs on each room, including what was originally the living room. The bylaws state more than two unrelated people by blood or marriage shall not occupy any unit. Currently there are 3 unrelated people living in this unit. There may even be a fourth. There have been many people that have moved in and out of the unit which has made other owners upset. In one case a tenant moved in at midnight on a Sunday night. What legal rights do we as the condo association have? What is the best way to pursue this problem?