Mason Street School Museum

Exchange Hotel, also called Tebbett's Place was is a historical building in San Diego, California built in 1851. The Exchange Hotel site is a California Historical Landmark No. 491, listed on October 10, 1951. The Exchange Hotel was built by George P. Tebbetts and his partner Philip Hooff. Tebbetts became the third mayor of San Diego in 1852. Lieutenant George H. Derby stand at the Exchange Hotel when he arrived in San Diego to plan the Derby Dike in 1853. Soon after Exchange Hotel opened on June 29, 1851, a group of Free Masons had a meeting. This was the first Freemasonry meeting in San Diego. The group started a lodge which became San Diego Lodge No. 35, F. & A.M., the oldest lodge in Southern California. Exchange Hotel became the Franklin House, when a third story was added to the Exchange Hotel by Messers Franklin. Joseph Mannasse owned the Franklin House for sometime. Racine & Laramie Tobacconist built both the Exchange Hotel and the Franklin House. The Franklin House was lost in an April 1872 fire, the site has been a vacant lot for sometime.

Casa de Pedrorena, also called Altamirano-Pedrorena House is a historical Adobe building in San Diego, California built in 1869. The Casa de Lopez site is a California Historical Landmark No. 70, listed on December 6, 1932. Casa de Pedrorena was the home of Miguel de Pedrorena. In 1838 Miguel de Pedrorena arrived in San Diego Viejo. Don Miguel was a member of the California Constitutional Conventions at Monterey, California in 1849. Monterey Convention of 1849 was the first California Constitutional Convention to take place, a major decidion of the convention was to ban slavery and set state boundaries. Pedrorena sister, Isabel de Altamirano, received the house in January 1871. Isabel de Altamirano married Jose Antonio Altamirano and they raised their family here. Jose Antonio Altamirano was born in 1835 in La Paz, Baja California. Jose Altamirano arrived in San Diego in 1849. In San Diego he did some mining and raised cattle in San Diego and Baja California. The house's current address, 2616 San Diego Ave in Old Town, San Diego. Casa de Pedrorena is the newest and last of Old Town San Diego's adobe houses.

Casa de Stewart, also called La Casa de Machado y Stewart is a historical adobe building in San Diego, California built in 1835. The Casa de Stewart site is a California Historical Landmark No. 73, listed on December 6, 1932. Casa de Stewart was built by José Manuel Machado, pioneer leatherjacket company soldier of the New Spain Army stationed in San Diego. He arrived at the San Diego Presidio in 1782 when he retired. Machado built the house for his daughter Rosa, she married Jack Stewart. Stewart from Maine and was pilot boat operator in Maine. The Stewarts enlarged the house. Carmen Stewart Meza lived in the house for 50 years. She moved out in after a 1966 flood. Casa de Stewart was acquired by California State Parks, who had it restored to a museum, Casa de Machado y Stewart Museum. The house's cuurent address, is 2707 Congress street, at Congress and Mason Streets, in Old Town, San Diego. José Manuel Machado house, Casa de Machado y Silvas built in 1832 is also a California Historical Landmark.

The Emmet House Site is a historical landmark designated by the San Diego, California government Historical Resources Board. The original construction started in the 1860s. Emmet House Site was constructed as a rooming house and restaurant and was later the location of San Diego's first County Hospital. The hospital operated during the 1870s. A coffin was stolen from the building in 1883. The building was demolished in 1949 but a historical marker has been placed at its original location. .It is one of over a dozen landmarks designated by the Historical Resources Board on November 4, 1970.

Casa de Lopez was a historical Adobe building in San Diego, California built in 1835. The Casa de Lopez site is a California Historical Landmark No. 60, listed on December 6, 1932. Casa de Lopez, often called the long House, built by Juan Francisco Lopez, a Spanish settler of San Diego. Casa de Lopez was one of the first large houses built in San Diego. Juan Matias Moreno lived in the house starting in 1846. Juan Matias Moreno as the secretary to 10th Governor of Alta California, Governor Pío Pico, the last Mexican governor. The house, with a current address of 3890 Twiggs Street, is now a restaurant in Old Town, San Diego. A Historical marker is on corner of Twiggs Street west of Congress Street built by the California State Park Commission.

San Diego Viejo Plaza, (San Diego Old Plaza), also called Plaza de Las Armas (Plaza of the Cannon), Old Town Plaza, Washington Square, is a historical site in San Diego, California. San Diego Viejo Plaza site is a California Historical Landmark No. 63, listed on December 5, 1932. The plaza (town square) was the center of Pueblo de San Diego founded in 1835 in Alta California.

Casa de Cota site in San Diego, California in San Diego County, is a California Historical Landmark No. 75 listed on December 6, 1932. The Casa de Cota House was built by Juan Cota or Ramon Cota at what is now Twiggs Street and Congress Street. The adobe house was removed by the United States Army to make room for an Army training camp used in World War II. The training camp was temporary and the site is now a parking lot. A California Historical sign is at the Old Town, San Diego parking lot.

San Diego University for Integrative Studies, also referred to as SDUIS, is a small, private university established in 1999 in San Diego, California, United States. SDUIS campus is located at 3900 Harney St. in Old Town, San Diego. It also offers a Distance Learning Program. The school offers certificate, bachelors, masters, and doctoral degrees.

Casa de Machado, also called Casa de Machado y Silvas is a historical Adobe building in San Diego, California built in 1832. The Casa de Lopez site is a California Historical Landmark No. 71, listed on December 6, 1932. Casa de Machado was built by José Manuel Machado, pioneer leatherjacket company soldier of the New Spain Army stationed in San Diego. He arrived at the San Diego Presidio in 1782 when he retired. José Manuel Machado built a house, Casa de Stewart, for his daughter Rosa, she married Jack Stewart. Stewart from Maine and was pilot boat operator in Maine. The Stewarts enlarged the house. Carmen Stewart Meza lived in the house for some years. The 1850s it was a Commercial Restaurant. 1930s, The Machado y Silvas family owned the house until the 1930s. In the 1930s and early 1940s the house was rooming-house, café, art studio, and souvenir shop. In 1942 the house became a church, Machado Memorail Chapel. Casa de Machado was acquired by California State Parks in 1968, who had it restored. The Casa de Machado y Silvas house's current address, 2737 San Diego Avenue, in Old Town, San Diego.

The Casa de Estudillo, also known as the Estudillo House, is a historic adobe house in San Diego, California, United States. It was constructed in 1827 by José María Estudillo and his son José Antonio Estudillo, early settlers of San Diego and members of the prominent Estudillo family of California, and was considered one of the finest houses in Mexican California. It is located in Old Town San Diego State Historic Park, and is designated as both a National and a California Historical Landmark in its own right.Besides being one of the oldest surviving examples of Spanish architecture in California, the house gained much prominence by association with Helen Hunt Jackson's wildly popular 1884 novel Ramona. The Casa de Estudillo is one of three National Historic Landmarks in Southern California that were closely tied to Ramona, a novel of Californio life shortly after the American acquisition of California; the other two are Rancho Camulos and Rancho Guajome.

Old Town San Diego State Historic Park, located in the Old Town neighborhood of San Diego, California, is a state protected historical park in San Diego. It commemorates the early days of the City of San Diego and includes many historic buildings from the period 1820 to 1870. The park was established in 1968. In 2005 and 2006, California State Parks listed Old Town San Diego as the most visited state park in California. In 1969, the site was registered as California Historical Landmark #830. Then on September 3, 1971, it was added to the National Register of Historic Places as Old Town San Diego Historic District.

The Johnson House or Johnson Building is a reconstructed historic building located on La Plaza de Las Armas at 2706 San Diego Avenue in Old Town San Diego State Historic Park in San Diego, California.