I live in a condo. The property has 8 units in total. Yesterday, one of the unit owners changed the lock of the gate without getting the permission of anyone. Though we all get keys, however the gate is locked from both inside and outside, which makes it very inconvenient to go in and out. We also do not have an intercom security system, so it is not possible to buzz anyone in. My question is: is it legal to change the lock of the common-area gate without the permission of the board? Second, is it legal to have a double secure lock on a gate without a buzzing- security system?