After developing Green Valley, Fine became an instrumental part of establishing Summerlin. During his four years as president of the Summerlin division of The Howard Hughes Corporation, Fine was responsible for launching the master-planned community, which became the nation's fastest-selling community. Today Summerlin is home to more than 85,000 people.
Fine created Mark L. Fine & Associates in 1976 and Fine Properties in 2005 with his son, Jeffrey Fine, to focus on the development of unique, high-end retail and office projects.
Fine believes it is imperative to be a contributing member to the communities he creates. He formerly served on the Southern Nevada Strategic Planning Authority and the Andre Agassi Foundation Board of Directors. He was the past president of the board of Class! Publications and a national trustee of the National Jewish Medical and Research Center.
Fine is a dedicated advocate for quality education. In addition to his work as chairman of the UNLV Foundation and former chairman of the UNLV Research Foundation Board of Directors, Fine is the founding director of the Clark County Business School Partnership Program. He has been active in the Clark County School District for more than 30 years. In 2007 he adopted Booker Empowerment Elementary School. In recognition of his long-term dedication to CCSD, an elementary school was namedin his honor in fall 2009.
Fine was a member of the Urban Land Institute for more than 30 years and was a founder of the Young President's Organization, trustee emeritus and former executive committee member of the Nevada Development Authority, and a former member of the Nevada Tax Commission. He has been a founding director of two community banks, Continental National Bank and Nevada First Bank.
The Nevada Business Journal named Fine one of Nevada's Top 50 Leaders and the Las Vegas Chamber of Commerce awarded him the Community Achievement Award in Real Estate and Land Development. He also was selected by In Business Las Vegas as one of Southern Nevada's Most Influential Businessmen, and was chosen as a member of the "Vegas Dozen" by the Nevada Cancer Institute.