Old Town Transit Center

Congress Hall was a historical wooden building in San Diego, California built in 1867. The Congress Hall site is a California Historical Landmark No. 66, listed on December 6, 1932, at 4016 Wallace Street, now Fandango Restaurant. Congress Hall building was a Pony Express Station from 1860 to 1861. Congress Hall was for a time a Robertson's saloon and billiard parlor. Congress Hall was built by George Dewitt Clinton and Washington, and Robinson. A historical marker is at the site of the former building a 2734 Calhoun Street, Old Town San Diego. Vincent Llucia purchased the building in 1870. Congress Hall was moved a to a nearby site across the plaza in 1870, by Vincent Llucia, to 4016 Wallace, Old Town San Diego, now Bara Bara saloon, at the southwest Corner of Calhoun Street and Wallace Street. At 4016 Wallace was the ruins of a 1830 house that had been owned by Rosario Aguilar and then Luis Serrano. The crumbling ruins were removed and Congress Hall moved to this lot. In 1884 Llucia changed the building in to a US Post Office. Vincent Llucia and his son, Vincent P. D. Llucia, became the Postmasters. The Congress Hall building was demolished in 1939.

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.

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 Cosmopolitan Hotel and Restaurant in the Old Town San Diego State Historic Park is a registered national historic landmark, built in the early 19th century by Juan Bandini and later purchased by Albert Seeley to serve as a stagecoach hotel. In 2010, restorations and added fine dining restaurant revived the hotel to its 1870s charm, making it again a focal point of the original downtown area.

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.

Mason Street Schoolhouse is a historical building in San Diego, California built in 1865. The Mason Street School District No. 1 is a California Historical Landmark No. 538, listed on September 14, 1955. The Mason Street School is the First Publicly owned School in San Diego. The school was used from 1865 to 1872. The Schoolhouse was moved once. For sometime in the 1940s to 1952 the Schoolhouse was a tamale restaurant, which operated out of the building until 1952. In 1952 San Diego County Historical Days Association acquired the Schoolhouse. The State of California acquired the Schoolhouse in 2013. The school building is now the Mason Street School Museum in Old Town San Diego at 3966 Mason Street. The school was restored in 1955.The Schoolhouse is 4-feet by 30-feet, 720 square feet with a 10-foot ceiling. The first teacher was Mary Chase Walker (1828–1899) born in Massachusetts. Walker graduated in 1861 from State Normal School in Framingham, Massachusetts and had a job teaching in Massachusetts. At the end of the American Civil War in 1865 Walker came to San Francisco, not finding a job there she travelling to San Diego. She took the teaching job for $65 a month (about $1,224.00 a month in today's dollars). Walker had 35 students of ages 4 to 17 in the single One room schoolhouse. Walker had the job for 11 months, when Walker married the school superintendent Ephraim Morse. A historical marker was place as the site by the San Diego County Board of Supervisors and The Historical Markers Committee in 1955.

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.

Casa de Carrillo House in San Diego, California in San Diego County, is a California Historical Landmark No. 74 listed on December 6, 1932. The Casa de Carrillo House is the oldest residence in San Diego. The Casa de Carrillo House was built by Presidio of San Diego Comandante Francisco María Ruiz (1754–1839). Ruiz was the leader of the Presidio from 1809 to 1827. The Casa de Carrillo house was built next to his pear orchard planted in 1808. The Adobe house was used by his relative and soldier, Joaquín Carrillo, and his family. Joaquín Carrillo, daughter Josefa Carrillo, ran away and sailed from the home and eloped to Chile with Henry Delano Fitch in April 1829. Francisco Ruiz died in 1839, when Joaquín Carrillo died, his son Ramon Carrillo sold the house and land to Lorenzo Soto. The house and land was sold a few times, it was poor condiction when sold in 1932 to George Marston and associates. George Marston and associates restored the house. After the restoration George Marston and associates donated the house and land to the City of San Diego. The City of San Diego turned the house and land into the Presidio Hills Golf Course. A California Historical marker is at the Old Town, San Diego Presidio Hills Golf Course, NE of Juan Street on Wallace Street. The Marker was place there in 1994 by State Department of Parks and Recreation working with the San Diego City Department of Parks and Recreation and Squibob Chapter, E Clampus Vitus.

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.

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.