Frank Lloyd Wright’s famed Ennis house, a Los Feliz hilltop masterpiece composed of patterned and smooth concrete blocks, is being offered for sale with a 5 million price tag. Built between 1923-1925, the house is one of four textile block homes built in L.A., and 27,000 blocks, both interior and exterior, were used in building the house that was inspired by Wright’s love of Mayan architecture.

Los Angeles ? Frank Lloyd Wright’s Ennis House, a hilltop masterpiece composed of patterned and smooth concrete blocks that has been threatened by man and Mother Nature, is being offered for sale at $15 million by the private foundation that has been restoring it.

Eric Lloyd Wright, the architect’s grandson and a member of the nonprofit Ennis House Foundation’s board, said that, given economic realities, private ownership would be the best way to save the house and honor his grandfather’s intentions.

“My grandfather designed homes to be occupied by people,” he said in a statement. “His homes are works of art. He created the space, but the space becomes a creative force and uplifts when it is lived in every day.”

Completed in 1924 for Charles and Mabel Ennis, the owners of a men’s clothing store who liked to entertain, the house was the last and largest of four homes that Wright designed in an experimental “textile block” style.

Mabel Ennis sold the house in 1936, and it has changed hands several times since. Radio personality John Nesbitt, who owned the property from 1940 to 1942, had Wright convert a ground-floor storage space into a billiards room with a fireplace, add a lap pool on the north terrace and install a heating system.

The house suffered over the years. In 1968, Augustus O. Brown, the last private owner, bought the estate for $119,000 and made extensive repairs. In 1980, he donated the property to a nonprofit trust he established to ensure that the house would be maintained. That group became the Ennis House Foundation.

The foundation began its restoration in 2005 after the estate, heavily damaged by rain and the 1994 Northridge earthquake, was placed on “most endangered” lists by both the National Trust for Historic Preservation and the World Monuments Fund.

Torrential rains had caused the retaining wall to buckle in March 2005, sending several patterned blocks tumbling down the hill. City inspectors briefly red-tagged the estate, spread on half an acre along a ridge with breathtaking views in the foothills northwest of downtown.

The estate, which is listed on the National Register of Historic Places, has been featured in films including “House on Haunted Hill,” “Grand Canyon” and the futuristic “Blade Runner.”

A new owner would face a projected bill of $5 million to $7 million to restore the house to its former grandeur, atop $6.5 million the foundation already has invested to stabilize the property and begin restoration.

Inspired by the ruins of Uxmal, Mexico, the 6,000-square-foot estate consists of a main house and a smaller chauffeur’s quarters, separated by a paved motor courtyard. Wright’s notion was to craft an organic structure that literally seemed to rise from the site.

Workers extracted decomposed granite from the property to use in many of the 27,000 blocks.