Small: $30,500+
Large: $75,000+

BEYOND DOUBT the most generally useful building in any park is a shelter, usually open but sometimes enclosed or enclosable, and then referred to as a recreation or community building, or a pavilion. 

The essentials of a shelter include first of all overhead protection and a place to sit and rest.  In size, shelters range from the very small and minor, in a simple rendering, to the large and complicated, when many extra-functional dependencies are included in the ambitious structures of a large, much-used park.