Board chair Frances Fisher's gift will launce the Magnolia Society of Ann Norton Sculpture Gardens donors who contribute $100,000 or more.
The evening included entertainment by Forest Hill High School's Dimension 20 choir, one of the organization's youth empowerment program partners.
The project would expand and renovate two of the key buildings at the Society of the Four Arts on Royal Palm Way.
Running until June, the exhibition is West Palm Beach-based artist Jane Manus' fourth exhibition with the Ann Norton Sculpture Garden.
Palm Beach sea-to-lake lot sees price hike from $150 million to $200 million. Price includes "concept" drawings for a mansion designed for the lot.