The house was accepted for the National Register in 1973 and was listed as a valuable historic property by Hawaii Historic Places. Walker’s widow Una maintained it by making the grounds available for weddings and tours. The City closed the gardens to the public in 1983, and in 1987 Una Walker died. In 1989 her family sold the house and its 5.86-acre grounds to a new owner, who commissioned Mason Architects to:
- Conduct on-site and archival research to document the house's original design and later alterations.
- Evaluate the existing condition of the structure.
- Create a master plan for the site, which would include two new residences, a new pool, and extensive improvements to the grounds.
- Completely renovate the house.
- Design two new bedroom suites and a Japanese tatami room without compromising the historic character of the residence.
The project received a Preservation Honor Award from the Historic Hawaii Foundation and a Grand Award in the Building Industry of America's Renaissance competition.
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