The other problem is that the buildings become nervous, that the liquefaction units cause vibrations that pass through the building. „Modification agreements are one of the most fundamental contracts we use in the cooperative/condo world. The question that often arises is: how long should you keep these recordings? Seven years, which is compatible with the limitation period of some registrations, or more? Berger says it`s very important for neighbors to document their condition before building their neighbors. The amendment agreement defines the rights and obligations of the housing corporation and the owner of the dwelling. It is generally claimed that the co-op or condominium is not responsible for the design or functionality of the furniture or improvements to the apartment. It also describes the rules of construction in the building: working hours, maintenance of the land and other requirements. 1. Read the change agreement before hiring a contractor. These include the verification process of the board of directors, the management company and the control architect. You submit architectural plans to your management company for verification. These plans must of course be drawn up by a registered architect. The Managing Agent forwards the plans to another architect for verification.. .