Question: South Coast Plaza is an upscale-luxury goods shopping mall in Costa Mesa, California, its 250 retailers represent the highest concentration of design fashion retail in the U.S, with the second highest sales-volume in California, second only to Westfield Valley Fair, an upscale indoor shopping mall in San Jose, California, United States, owned by which organization?
Context: The Valley Fair Shopping Center, Valley Fair Mall, or Valley Fair Center was a shopping mall in Appleton, in the U.S. state of Wisconsin that opened on March 10, 1955.  The mall billed itself as the first enclosed mall in the United States.  Demolition of parts of the shopping center began on August 8, 2007. Ashley Landing (originally opened as Ashley Plaza and later known as Ashley Plaza Mall), built in 1970, was the first indoor shopping mall built in the West Ashley area of Charleston, South Carolina.  The center is located at 1401 Sam Rittenberg Boulevard (S.C. Highway 7) at the fork of Old Towne Road (S.C. Highway 171).  It was built as a joint venture of shopping center developers the LeFrak Organization of New York City and The Cordish Company of Baltimore, Maryland under the name Ashley Plaza Mall Associates.  Ashley Plaza Mall was originally constructed in the late 1960s as a strip shopping center featuring a J.M. Fields Department Stores joined to a Pantry Pride supermarket.  In 1970 the locally owned Condon's Department Store was built adjacent to Pantry Pride as a freestanding building.  The center was originally known as "Ashley Plaza" and had a large red and white neon pylon "Ashley Plaza" sign in the center of the parking lot that remained until 1989 when it was destroyed by Hurricane Hugo. Santana Row is an outdoor shopping mall in San Jose, California.  Westfield Valley Fair is located across Stevens Creek Boulevard from it, and the Winchester Mystery House is just to its west, across Winchester Boulevard.  It was developed during 2001-2002 as a $450 million, 42-acre retail and residential “village within a city”, developed by Federal Realty of Rockville, Maryland.  It is regarded as a successful example of a Mixed-use Development.  Some of the development has continued into 2017. The Winchester area of San Jose, California gains its name from early resident Sarah Lockwood Winchester, a Connecticut native and heiress to fifty percent ownership of the Winchester Repeating Arms Company, who built the famous Winchester Mystery House.  Located between San Tomas Expressway and State Route 17/Interstate 880, and between the city's borders with Santa Clara and Campbell, centered on Winchester Blvd.  Winchester is one of the West Valley neighborhoods, with West San Jose to the west and Burbank and the Rose Garden to the east.  It is the home to the Westfield Valley Fair, and Santana Row shopping centers. Plaza Las Américas is a shopping mall in Hato Rey, San Juan, Puerto Rico, located at the intersection of Routes 18 and 22.  It is near the Roberto Clemente Coliseum, the Hiram Bithorn Stadium, and the WKAQ-TV's studios. " "Plaza"", as it is known to many Puerto Ricans, was the first indoor shopping mall built in Puerto Rico.  It is the largest shopping mall in the Caribbean and the second largest in Latin America. Power Plant Mall is an upscale indoor shopping mall in Makati City, Philippines.  It is the anchor establishment of Rockwell Center, a mixed-use area north of the Makati Central Business District on the Pasig River waterfront across Mandaluyong.  It is one of two shopping centers developed and managed by Rockwell Land Corporation, a subsidiary of Lopez Holdings Corporation, in Metro Manila.  It was designed by Toronto-based architecture firm, Design International. C J Segerstrom & Sons is a family business incorporated as a major real estate company in Orange County (along with the Irvine Company and the O'Neill family), especially in the city of Costa Mesa.  Swedish immigrant Carl Segerstrom started out by buying a large lima bean farm in 1900.  In 1967 construction began on the jewel in their crown, South Coast Plaza.  The enormous shopping mall is one of the highest grossing in the country, with over 300 stores and around one and a half billion dollars in annual sales.  The family's monetary donations provided for the construction of the Orange County Performing Arts Center, on land also donated by the family/company.  Besides the performing arts center the family/company gives heavily to the local Newport-Mesa school district.  The family also owns land rights to much of the expanding commercial office space around the mall.  Though they have sold the property rights to the residential areas south of the 405 Freeway, they still hold the mineral rights. Scottsdale Fashion Square is an upscale, super-regional luxury shopping mall located in the downtown area of Scottsdale, Arizona.  It is the largest shopping mall in Arizona and the American Southwest, with approximately 2 million square feet (180,000 m²) of retail space, and is among the top 30 largest malls in the country.  It has consistently been one of the most profitable malls in the United States, being ranked in 2016 as the second highest sales per square foot mall in the country, and as of 2016, it was ranked in the top 25 most visited malls in the country by "Travel + Leisure" magazine.  The mall is located on the northwest corner of Scottsdale Road and Camelback Road in Scottsdale, Arizona, and has been owned by Westcor, a subsidiary of Macerich, since 2002. South Coast Plaza is an upscale-luxury goods shopping mall in Costa Mesa, California.  The largest mall on the West Coast of the United States, its sales of over $1.5 billion annually are the highest in the United States.  Its 250 retailers represent the highest concentration of design fashion retail in the U.S, with the second highest sales-volume in California at 800 $/sqft —second only to Westfield Valley Fair in San Jose-Santa Clara, at 809 $/sqft .  The national average is 411 $/sqft .  The mall is anchored by three Macy's stores, Sears, Nordstrom, Bloomingdale's, and Saks Fifth Avenue. Westfield Valley Fair, formerly named and commonly known as Valley Fair, is an upscale indoor shopping mall in San Jose, California, United States, owned by the Westfield Group.  It is located in the heart of Silicon Valley, at the corner of Winchester and Stevens Creek Boulevards, straddling the border of San Jose and Santa Clara.  The eastern portion of the mall (including Nordstrom and Macy's women) is located in San Jose, and the western portion (including Macy's Mens & Home) is located in Santa Clara.
Answer: Westfield Group