The Obamas are reportedly poised to purchase a custom-built high-class home in the Rancho Mirage section of California for $4.25 million. White House officials deny the reports, but realtors say otherwise, claiming that the first family are in escrow for the Thunderbird Heights community house, located on a hilltop near Palm Springs in the same area once called home by Frank Sinatra, Bob Hope and Bing Crosby, the Los Angeles Times reports. …