Title: Puente Hills Mall
Content:  Puente Hills Mall served as a filming location for the fictional Twin Pines Mall (later Lone Pine Mall) in the 1985 film Back to the Future. In the film, Doc Brown (Christopher Lloyd) uses the mall's south parking lot (visible in the above photograph) to stage his time travel experiments with the DeLorean time machine. The JCPenney and Robinson's stores feature prominently in the background. A Ross Dress for Less store can be seen in a strip mall across the street. The scenes were filmed in January 1985. According to the DVD audio commentary, screenplay writer Bob Gale says that several fans gathered at the Puente Hills Mall in the early hours of October 26, 1985, the date given in the film as the present day, to see if anything would happen. Puente Hills Mall featured replicas of the Twin Pines Mall sign, the time machine, and Dr. E. Brown Enterprises truck in its parking lot in October 2015.
Title: Puente Hills Mall
Content:  Puente Hills Mall, located in City of Industry, California, United States, is a major regional shopping center in the San Gabriel Valley region of Los Angeles County. It is most famous for serving as the filming site for the Twin Pines/Lone Pine Mall for the 1985 movie Back to the Future starring Michael J. Fox and Christopher Lloyd. Anchor stores are Burlington, Macy's, and Ross Dress For Less.
Title: Hill Valley (Back to the Future)
Content:  park outside of the courthouse has been converted into a parking lot. "That was always one of the major elements of the story even in its earliest incarnation," screenwriter Bob Gale says in The Making of Back to the Future, "was to take a place and show what happens to it over a period of thirty years. What happened to everybody's home town is obviously the same thing. They built the mall out in the boonies, and killed all the business downtown, and everything changed." By the 21st century, the downtown area has experienced a revival as the courthouse has been converted into the Courthouse Mall. Businesses have begun to move back into and 
Title: Back to the Future
Content:  Walt Disney Studios-owned Golden Oak Ranch in Newhall, Santa Clarita, California, serves as the Twin Pines ranch where Marty lands in 1955 and Puente Hills Mall in Rowland Heights is the Twin Pines mall that replaces the ranch in 1985. Other locations include the basement of the Hollywood United Methodist Church where the school dance was filmed, and Griffith Park, where Marty begins his drive to the courthouse to return to 1985, crossing by a lamp post, situated outside of the Greek Theatre. Filming concluded after 107 days on April 26, 1985. The final day of filming included pick-up shots of Marty and Einstein the dog in the DeLorean.
Title: An Act of Murder
Content:  The Courthouse Square set (which later received that name for having been prominently featured in Back to the Future) was built on the Universal Studios backlot for this film.
Title: Hill Valley (Back to the Future)
Content:  For Back to the Future, the producers considered filming the town square scenes in the real city of Petaluma, California, but soon realized it would be prohibitively expensive and impractical to alter a real place to suit the different eras. Instead filming was completed on the Universal Studios backlot, where they had more control. The town square set, once called Mockingbird Square after the 1962 film To Kill a Mockingbird but now known as Courthouse Square, had been used for many films and television shows dating back to 1948's An Act of Murder. One notable example is the very first episode of the sci-fi series The 
Title: Hill Valley (Back to the Future)
Content:  Twin Pines Mall is a shopping center located outside Hill Valley, where Doctor Emmett Brown first tests his time machine, making his dog Einstein the first time traveler in the world. The site where the mall was filmed for the movie is actually Puente Hills Mall, located in City of Industry, California. The J.C. Penney location seen in the movie has been shut down and is now occupied by a 24 Hour Fitness center. The mall's name changed to Lone Pine Mall after Marty went back to 1955, because he accidentally destroyed one of the two baby pine trees for which it was named as he fled an irate Old Man Peabody, whose barn the DeLorean had crashed into upon arriving in 1955.
Title: Courthouse Square
Content:   Courthouse Square is a backlot located at the Universal Studios Lot in Universal City, California. The set is composed of several facades that form an archetypal American town square with a courthouse as its centerpiece. The set was built for the 1948 film An Act of Murder, and is best known for being featured as downtown Hill Valley in the Back to the Future trilogy, as well as Kingston Falls in the Gremlins series. Prior to the Back to the Future series, the area was known as Mockingbird Square owing to its role in the film To Kill a Mockingbird. It has been severely damaged by fire several times, including in 1957, 1990 and 2008. It was reconstructed after each incident.
Title: Back to the Future
Content:  California. When filmed from below, Lloyd was positioned on a recreation of the clock tower, but when filmed from above, Lloyd stood atop the tower itself. Production designer Lawrence G. Paull insisted on using the Universal backlot sets because of the difficulties and costs involved in making an on-location area look 1955 appropriate. Whittier High School in the city of Whittier is the Hill Valley high school. Marty's home and the surrounding Lyon estates are in Arleta, Los Angeles. Several of the residential locations were filmed in Pasadena: Lorraine's and George's 1955 homes, and Doc Brown's 1955 home—its exterior is the Gamble House—and interiors were shot at the Blacker House. 
Title: DMC DeLorean
Content:   The DMC DeLorean is most notably featured as the time machine in the Back to the Future film trilogy. Six DeLorean cars were used during the production, along with one manufactured out of fiberglass for scenes where a full-size DeLorean was needed to "fly" on-screen. The cars used in the first film had the original V6 engine (whose sound in the movie comes from the V8 engine of a Porsche 928). Two of the cars used in Back to the Future Part III were equipped with Volkswagen engines and dune buggy chassis for filming the scenes in the Western terrain. Only three of the cars still exist, with one that was destroyed at the end of Part III, two additional cars were abandoned, and the fiberglass replica used in Part II was scrapped. Universal Studios owns two of the remaining cars, occasionally putting them on display or using them for other productions. The third car, used in Back to the Future Part III, was restored and was sold at auction for $ 541,200 in December 2011. A fully restored Back to the Future DeLorean can be viewed at the Petersen Automotive Museum in Los Angeles.

Question: what mall did they use in back to the future?
Answer: Puente Hills Mall.