thus razing all of the Temporary Buildings will San Diego enter upon the heritage that is rightfully hers". However, many of the "temporary" buildings were retained and reused for the 1935 fair. Four of them were demolished and rebuilt in their original style toward the end of the 20th century; they are now called the House of Charm, the House of Hospitality, Casa del Prado, and Casa de Balboa, and are included in the National Register of Historic Places-listed El Prado Complex. Transportation One of the main considerations for San Diego leaders concerning the Panama–California Exposition was transportation. At the request of John D. Spreckels and his San Diego Electric Railway Company, the park's layout design incorporated an electric railway that ran near the east gate of the park. To service the large number of people that were to attend the exposition, streetcars were built that could handle the traffic of the event as well as the growing population of San Diego. The routes ultimately spanned from Ocean Beach, through Downtown, Mission Hills, Coronado, North Park, Golden Hill, and Kensington, even briefly serving as a link to the U.S.–Mexico border. Today, only three of the original twenty-four Class 1 streetcars remain in existence. At the beginning of the exposition, 200 small wicker motorized chairs, known as electriquettes, were available for rent by visitors. Constructed by the Los Angeles Exposition Motor Chair Company, these slow-speed transports held two to three people and were used for traveling throughout the majority of the exhibition. For the centennial celebration in 2015, plans are being developed to provide replica electriquettes for visitor rentals. Other features Additional elements of the exposition included an aviary, rose gardens, and animal pens. Throughout the exposition grounds there were over two million plants of 1,200 different types. Peacocks and pheasants freely wandered through the fairgrounds, and pigeons were frequently fed by guests. At the opening of the exposition, it did not feature any buildings that were represented by foreign countries. A handful of U.S states held exhibits southwest of the organ pavilion: Kansas, Montana, New Mexico, Washington, and Utah (Nevada's building was located near the open-air theatre). In contrast, the San Francisco Panama-Pacific Exposition featured exhibits from 22 countries and 28 U.S. states. Many of the state buildings would eventually be used for the 1916 extension by various countries. The majority were temporary structures that were demolished after the expo.