Lonnie Hammargren Net Worth: How a Neurosurgeon’s Dream House Ended in Foreclosure

Lonnie Hammargren, who died on June 13, 2023, at age 85, was Nevada’s first licensed neurosurgeon, an Apollo-era NASA flight surgeon and the state’s lieutenant governor. He was just as famous for the sprawling Las Vegas house he filled with casino signs, space artifacts and Las Vegas history. His finances never matched that reputation. No audited or credible net worth figure has ever been published, and the documented record points to a man who spent far more on his collection than most people earn from a medical career, then lost the main house to foreclosure.

Who Was Lonnie Hammargren?

Born on December 25, 1937, in Harris, Minnesota, Hammargren trained in medicine and worked as a flight surgeon for NASA’s Apollo program from November 1965 to March 1966. He moved to Las Vegas and in 1971 became the first licensed neurosurgeon in Nevada. His cases drew public attention, among them the 1982 operation on boxer Duk Koo Kim, who died of his injuries.

Politics followed. He served as a regent of Nevada’s university system from 1988 to 1994, then as the state’s 31st lieutenant governor from January 1995 to January 1999, a Republican serving alongside Democratic Governor Bob Miller. He lost the 2006 Republican primary for the same office, and in 2008 he became honorary consul for Belize. In 1989 he married Sandy, and their wedding was filmed for the TV series Lifestyles of the Rich and Famous. He died from a subdural hematoma, with dementia and heart disease complicating his health.

Lonnie Hammargren Net Worth: What the Record Shows

The public record offers pieces of the picture rather than a total. Neurosurgery was his main source of income for decades, but it ended earlier than many assume. He stopped operating in 2005 because his malpractice insurance had climbed to $275,000 a year, and a 2009 settlement committed him to stop practicing permanently. His Nevada medical license, kept on paper afterward, expired in 2017. The state medical board also logged four malpractice judgments of $5,000 or more against him over his career.

His public offices added little. Lieutenant governor is a modest salaried post, and nothing in the record suggests a large pension or investment portfolio. What does appear is spending: by 2016, reports put what he had poured into his collection at an estimated $10 million, set against roughly $750,000 in debt. Any article quoting a precise net worth for him is guessing, and the honest summary is that his wealth was tied up in objects rather than liquid assets.

The House Called Castillo del Sol

Hammargren built the house, known as Castillo del Sol, or Castle of the Sun, in 1969 and kept adding to it. As the collection outgrew the building, he bought two neighboring houses to hold the overflow; those were fully paid off, while the original home was not. Inside were pieces of Las Vegas and space history: an Apollo capsule, a roller coaster car from the Stratosphere, a stained-glass dome from the Dunes casino, a chandelier from the original Flamingo and a staircase that once belonged to Liberace’s Riviera show.

For more than twenty years he opened the property to the public every Nevada Day weekend, and the house later appeared on a Travel Channel program. That openness is a large part of why it is remembered as a living museum rather than just a luxury home.

Debt, Foreclosure and the Auctions

The money problems became public in 2016 and 2017. Hammargren sold 27 items at auction to raise cash, but the sale netted just over $4,000, far short of what the house needed. In May 2017 public radio station KNPR, citing the Las Vegas Review-Journal, reported that Castillo del Sol was in foreclosure while the two neighboring houses were safe. Some of the collection was headed to auction and some to a downtown Las Vegas antiques store. Local outlets later described the Nevada Day tradition as ending with the foreclosure. Sources differ on whether the foreclosure auction itself fell in 2016 or 2017.

The episode shows the risk in his approach. Collectibles tied to one man’s passions are hard to value and harder to sell quickly, and they cost money to insure, store and maintain while producing no income.

What Happened to the House

A new owner bought Castillo del Sol after the foreclosure and has spent nearly a decade restoring it. In October 2025, FOX5 Las Vegas reported that the house was listed for about $2.5 million, the first time it had been offered for sale in roughly fifty years. Part of Hammargren’s original collection had been sold off at estate sales, but the house still contains features such as Swarovski chandeliers, a planetarium and a tomb painted with hieroglyphs depicting his life. The reports reviewed did not say whether the sale has closed since.

The Bottom Line

Lonnie Hammargren’s net worth cannot be pinned down from public records, and the best-documented figures, a collection that cost an estimated $10 million and about $750,000 in debt, point to a modest finish rather than a fortune. What he left behind is harder to price: a neurosurgeon who made Nevada medical history, a lieutenant governor, and a house that preserved a version of Las Vegas that has largely disappeared.