Optical/near-infrared observations of infrared-excess Palomar-Green QSOsGround-based high spatial resolution (FWHM <0.3-0.8) optical and near-infrared imaging at BIHK'(0.4 - 2.2 mu m) is presented for a complete sample of optically selected Palomar-Green QSOs which have infrared excesses at least as great as those of warm AGN-like ultraluminous infrared galaxies.