Sun Communities, Inc., a Maryland corporation, and all wholly-owned or majority-owned and controlled subsidiaries, including Sun Communities Operating Limited Partnership, a Michigan limited partnership (the "Operating Partnership") and Sun Home Services, Inc., a Michigan corporation ("SHS") are referred to herein as the "Company," "us," "we," and "our". We are a self-administered and self-managed real estate investment trust ("REIT").
We are a fully integrated real estate company which, together with our affiliates and predecessors, have been in the business of acquiring, operating, developing, and expanding manufactured housing ("MH") and recreational vehicle ("RV") communities since 1975. We lease individual parcels of land ("sites") with utility access for placement of manufactured homes and RVs to our customers. We are also engaged through a taxable subsidiary, SHS, in the marketing, selling, and leasing of new and pre-owned homes to current and future residents in our communities. The operations of SHS support and enhance our occupancy levels, property performance and cash flows.
We own, operate, or have an interest in a portfolio of MH and RV communities. As of December 31, 2018, we owned, operated or had an interest in a portfolio of 371 properties in 31 states and Ontario, Canada (collectively, the "Properties" or "Communities"), including 230 MH communities, 110 RV communities, and 31 Properties containing both MH and RV sites. As of December 31, 2018, the Properties contained an aggregate of 128,454 developed sites comprised of 84,428 developed MH sites, 24,535 annual RV sites (inclusive of both annual and seasonal usage rights), and 19,491 transient RV sites. There are approximately 11,000 additional MH and RV sites suitable for development.