Actually, it was a rental building where the mother makes her money renting apartments to tenants. Whatever the case, Gersh was offering to be her realtor and telling her that she needs to sell the property or else she would have 100 protestors out front every day, which would drive the price down. She even said that the building would have to be sold at bottom dollar, but that she already had a buyer up and ready to purchase the moment she was willing to negotiate.
I see; people have complained about that in other areas (Brooklyn, for example).