Protesters decried gentrification outside a real estate summit at the Brooklyn Museum Tuesday.

The activists say that new development is threatening community gardens and pricing longtime residents out of their own neighborhoods.

"We don't mind progress, but that should not mean on the other hand people who have been living here are losing their homes," says Alicia Boyd, an activist with the Brooklyn Anti-Gentrification Network.

Organizers of the summit invited a representative of the protesters to speak inside the summit, but participants say they declined to participate.