A boutique Manhattan condo building that drew celebrity buyers including Chelsea Clinton, NASCAR champion Jeff Gordon and Jennifer Lopez also had an unlikely early investor: convicted pedophile Jeffrey Epstein. Documents from the recently released Epstein files reveal that the disgraced, and deceased, financier quietly backed the luxury conversion of 21 E. 26th St. in NoMad, a historic property overlooking Madison Square Park later marketed as the Whitman. The five-story Neo-Georgian building was transformed into just four full-floor residences and a duplex penthouse, a design that helped lure a roster of high-profile buyers when sales launched in 2013, according to the...