The Levitt family began and perfected their home construction techniquesduring World War II with contracts to build housing for the military on the East Coast. Following the war, they began to build subdivisions for returning veterans and their families. Their first major subdivision was in the community of Roslyn on Long Island which consisted of 2,250 homes. After Roslyn, they decided to set their sights on bigger and better things.he potato fields located 25 miles east of Manhattan on Long Island was named Levittown, and the Levitts began to build a huge suburb. The new development ultimately consisted of 17,400 homes and 82,000 people.