Downtown Durham, Inc. (DDI) is a 501(c) 6 organization, formed in 1993 to serve as a catalyst for downtown revitalization. With almost $2 billion invested over the past 20 years, downtown is now a thriving climate able to support additional business, retail and housing growth. Since 1993 Downtown has grown from just 160 residents to more than 4,500, added more than 300 new businesses, increased its annual visitors by more than 1 million and added more than 2 million square feet of new office space In 2012, DDI became the entity responsible for the downtown Durham Business Improvement District, a .8 mile area where property owners are assessed a small additional tax to create a cleaner, safer and more vibrant downtown community. The tax is used by the BID to fund the Ambassadors program, which provides maintenance services that supplement those offered by the city, as well as to develop and fund district-wide placemaking and marketing initiatives that support businesses located in the district.