Community groups today will urge Boston Mayor Martin Walsh to expand the Inclusionary Development Program (IDP).

At an event at Boston’s city hall, city residents as well as members of tenant, homeless and community groups will deliver a petition with more than 800 signatures to Walsh, asking him to expand the IDP and to direct funds from the program and city-owned land to house Boston’s low-income and working class residents.

"If we want to keep Boston as a vibrant, world-class city, we ought to help keep existing working families and individuals on low or fixed incomes in their communities and homes. Boston’s Inclusionary Development Funds are a tool to support development of affordable housing," Darnell Johnson of Right to City Boston said in a statement.

A recent study named Boston the most rapidly gentrifying city in the country and revealed more than 35,000 low income families and individuals spend more than 50 percent of their income on rent.

The Inclusionary Development Program was created by former Mayor Thomas Menino’s executive order and requires market-rate and luxury housing developers to make 15 percent of the proposed units on site affordable, or build them off site or pay approximately $200,000 (per unit not built) into an affordable housing fund.