Final answer:
In situations where the Declaration of Condominium or Cooperative is silent about alterations, a common default rule is that 75% of unit owners must approve any significant changes. This percentage may vary based on jurisdiction and specific governing documents.
Step-by-step explanation:
If the Declaration of Condominium or Cooperative (often referred to as Declaration of Condo or Coop) is silent on certain matters, such as alterations or improvements ('betterments'), there is often a default procedure that must be followed. Typically, this procedure may require a certain percentage of unit owner approval before any significant alterations can be made to the common elements or to the external appearance or structure of the units.
Although the specific percentage required can vary based on jurisdiction and the governing documents of the condominium or cooperative, a common default percentage is 75%. To be precise, if the Declaration does not specify the procedure, a general rule of thumb is that 75% of the unit owners must approve the alteration or betterment. However, this can differ widely, and it's important to consult the laws governing condominiums and cooperatives in your specific state or country, as well as any rules set forth by the homeowners association (HOA) or coop board.