Holtz Realty: Holtz Realty was founded in 1943 by Ray Holtz. Some years later he was instrumental in establishing the present day Mason City MLS Service. Thanks to Ray Holtz's vision for the future, Holtz Realty has continued to place their clients and customers first...without exception. In good times and in bad, Holtz Realty is here for you. If you are buying, selling or renting, the agents at Holtz Realty can make it happen for you....and that's a promise!. Enter