In an HOA, a common area would typically be a landscaped area along the edge of the development, a pond or creek, or even a golf course if it is owned and managed by the HOA.
I understand that.
If land is on the survey of a parcel of specific dimensions that someone purchased with their own money, it’s theirs, no matter how they decide to use it or not.
Taking it is no different than robbing them of their actual money.