San Diego’s most iconic architectural tower sat closed and vacant for over 80 years until the invisible architects came in.

A century ago, the dramatic structure we now know as the California Building greeted visitors to the 1915–16 Panama–California Exposition in Balboa Park. It was covered in ornate pilasters, colorful tiles shone on its domed roof, and an attached eight-story tower surveyed the expo below. The building resembled a church, yet attendees who stepped inside expecting a sermon instead encountered an exhibit called The Story of Man Through the Ages. The showcase would inspire the building’s longtime-permanent use as the Museum of Us (formerly the Museum of Man).

Its tower became famous but furtive. Shut to the public in 1935, it spent decades as an instantly recognizable but inaccessible landmark. Finally, the museum decided that the California Tower would reopen for tours by 2015 and be outfitted for earthquake safety by 2020.

The challenge was significant. In order to keep it secure during seismic shifts, the whole structure needed steel braces, concrete walls, and tension rods—major infrastructure that had to remain a secret; hidden so that it didn’t alter the tower’s legendary look.

The people who completed the work were secret, too. Sort of.

“We call ourselves ‘invisible architects,’” says David Marshall, principal architect at Heritage Architecture & Planning, the firm tasked with restoring the California Tower. “Most architects going through school, their dream is to create something that’s never been created before. That’s not what preservation architects do. We are following the footsteps of great designers, and we don’t want to leave our fingerprints on everything we work on.”

Marshall has spent the last 35 years returning iconic San Diego structures to their original shine: Balboa Theatre, the Top Gun house, Hotel del Coronado, and the Western Metal Supply Co. building, to name a few. And those are just the well-known ones. San Diego has more than 1,000 buildings—from modest homes to multi-story civic structures—that qualify as historic for various reasons.

“Number one is age: It has to be over 30 years old,” says Cathy Herrick, who founded the development company San Diego Historic Properties with her father Leon in 1984. (Though that’s not a hard-and-fast rule—Marshall’s team was able to help top local architect Jonathan Segal designate three of his buildings constructed after 2000, since any structure proven to be architecturally significant is up for consideration.)

“Second, it has to have enough of its original fabric—like 90 percent,” Herrick continues. The preservationist’s ultimate goal is to gently repair and, if absolutely necessary, replace weakened or damaged portions of the building while making modern safety and accessibility upgrades.

Marshall and his team completed a $160 million renovation at the Hotel del Coronado last year, and even seemingly minor details required some creative problem-solving.

“We were trying to bring back the historic handrails around the front porch,” he explains. “They were built in 1888, so they didn’t meet the current code—they were only 29 inches tall instead of 42 inches tall.” On top of their diminutive stature, the handrails had seven-inch gaps between their pickets, more than twice the current safety requirement of less than four inches. The Heritage Architecture team’s solution: build exact replicas of the original handrails, but add a frameless glass rail behind them that’s only visible up close.

At The Beau—Herrick’s $5 million restoration of an 1886 Gaslamp Quarter hotel said to have been a favorite haunt of Al Capone—“there was a section of redwood staircase banisters and posts that were deteriorated,” Herrick says. “We took the pieces that remained and sent them to Northern California to a guy who specializes in hand-tilling [creating a distressed appearance on the redwood]. He made new pieces to match the historic.”

Restoring an old building for a new purpose—which preservation architects call adaptive reuse—can become even trickier. “Standard number one is to find a new use that’s compatible with the historic use,” like turning an old hotel into apartments, Marshall says.

His team transformed the Western Metal Supply Co. building at Petco Park into suites and a team store for Padres fans. “Warehouses like that are the easiest to convert because they’re usually large, open spaces with very few columns and partitions,” he explains. Any additions can be torn out by future preservationists, returning the building to its original state.

All these efforts to preserve the past don’t come cheap. “At The Beau Hotel, we wanted to put back the original 140-year-old bay windows. There were only eight of them, but it would have cost me $750,000,” Herrick says. “You sometimes have to make the economic decision to go with something that looks like the original but really is new.”

Another challenge is that skilled artisans capable of restoring and replicating historical designs and materials are becoming increasingly rare. Over her four-decade career, Herrick utilized craftspeople—some in their 80s—who specialize in unique skills like repointing historic brick or reworking century-old window sashes. “Those guys aren’t around anymore,” she says. “It’s a lost art.”

Historical preservation may also be under threat from a policy perspective. As of now, the City of San Diego automatically reviews any building that’s over 45 years old before it’s demolished or its exterior is altered. But with the city’s current focus on densification and increased housing, Marshall says, “there seems to be a lot of push for fewer restrictions on new construction in historic neighborhoods.”

A proposed amendment to the current Heritage Preservation program would alter that automatic review process because it is “a reactive and, overall, less efficient approach to historic preservation,” says Kelley Stanco, deputy director of Climate, Preservation & Public Spaces for the City Planning Department. “Of the roughly 3,500 properties reviewed every year, 85 to 90 percent are found to have no potential historic significance. In addition to creating unnecessary delays for project applicants, it is an ineffective use of city resources that could be more effectively spent proactively surveying and identifying what is significant and bringing those properties forward for designation.”

Another suggested amendment would give the Historical Resources Board new recourse for overturning historical designations. “If a building owner wants to tear down these newly designated historic houses, they’re gonna go to the council and appeal and, depending if they have any leverage—financially or otherwise—the council could say, ‘It’s not historic anymore,’” Marshall says. He fears that the change would “open the door to nothing being able to stay designated historic and nothing being safe from demolition.”

Stanco argues that changes to the city’s Heritage Preservation program are intended “not to eliminate historic preservation, but rather to incorporate…other important factors” like housing, equity, and sustainability.

The Save Our Heritage Organization (SOHO), a nonprofit dedicated to preserving historical architecture in San Diego, recently sent a letter, signed by former members and staff of the San Diego Historical Resources Board, to Mayor Todd Gloria and the city council decrying delays in historic designation reviews and nominations, among other concerns.

Ultimately, “growth and preservation are compatible,” believes SOHO Executive Director Bruce Coons. “The fact of the matter is that even if all the eligible houses and buildings were designated, it would be one percent or less of the city’s entire housing stock.”

Coons considers many historic properties “naturally occurring affordable housing”: They already exist, for one, giving them a financial leg-up on costly new builds. They’re also typically smaller than contemporary homes, and San Diego’s Mills Act financially incentivizes homeowners to maintain their historic houses through property tax relief. A number of structures in older San Diego neighborhoods also added ADUs during the first and second World Wars, contributing to density.

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And beyond the practical, these structures contribute an inimitable texture to the local landscape. San Diego is unique for its mix of architectural styles—the famous Spanish Revival buildings, of course, but also Victorian, Pueblo-style, Art Deco, Craftsman, ranch-style, and midcentury-modern structures, spread across popular neighborhoods like Hillcrest, Bankers Hill, North Park, Point Loma, La Jolla, Logan Heights, and more.

“Our built environment is really what makes San Diego what it is,” Coons says. “It’s difficult to get meaning from a stucco box. I think San Diegans want to feel like San Diegans, and [historical buildings] provide that context, meaning, depth, and character to our lives. We realize that when they’re gone.”