Established in 1960, National Realty Corporation, a multi-generational family business founded on strong family values, is on ... e of the largest real estate, commercial development, and management companies in Delaware County, PA. With our roots firmly planted in Delaware County, our corporate philosophy is to pay attention to every detail and build each of our locations brick by brick. Managing all of our properties in-house enables us to provide hands-on attention and care for every one of our tenants. We are determined to provide outstanding service, expand relationships, and, most of all, we are deeply focused on the long-term success of our tenant’s businesses and the communities that surround them. read more