The De Guigne/Musk estate at 891 Crystal Springs Road has now closed escrow at $30,000,000. The home was officially listed on MLS for $31,990,000 on October 11, although has previously been marketed and shown at $37,500,000. Seller Elon Musk had purchased the estate in 2017 for $23,364,000. The $30.0M closing represents the #2 sale in Hillsborough history, second only to 835 Chiltern closing for $37,500,000 in the frothy Dot-Com Era of Year 2000. Not visible from the road, 891 Crystal Springs boasts 47 Acres with a vintage 16,000 ft. mansion designed by Bliss and Faville. This architectural firm was considered one of the elite of the West Coast Gilded Age, boasting a portfolio of iconic San Francisco buildings including the Crocker-commissioned St. Francis Hotel on Union Square, Bank of California at 400 California Street (at Sansome), the Flood Mansion at 2222 Broadway, the Geary Theater, and Walter Bliss' own home at 2990 Vallejo. 

See also: 

https://hillsboroughblog.com/Epic-Month-for-Hillsborough-Ultra-High-End