In 1917 Singer met the future Palm Beach architect
Addison Mizner; they became "inseparable." Deciding to build one in Palm Beach, after consulting with Mizner, he bought a large parcel of land on which the "Touchstone Convalescent Club"{{citation Paris Singer was the president of the Everglades Club, as the convalescent home soon became (the war had ended), and lived there in an apartment constructed for him. He planned on what became
Singer Island a hotel, the Blue Heron, designed by Mizner, to be the most luxurious ever built, as part of a large new resort. An "aerial ferry" would connect it to the mainland, with 12 cable cars 136 feet above the water, since
West Palm Beach refused to permit a bridge. It was the largest building Mizner ever designed. Because of the
Florida real estate collapse of 1926 and its effects on Singer, the hotel was not completed. It was known as "Singer's Folly" until razed in 1940. This also contributed to the end of Singer's close friendship with Mizner, which ended in 1927. ==Financial decline and death==