Update 19 September 2022: 1740 20th Street has been reduced by more than $1 million to $8,700,000. — The last time 1740 20th Street changed hands (for a reported $9,500,000 in a September 2015 off-market sale), it trounced Potrero Hill's previous price record holder by almost $6 million. To date, no residential property has come close to touching...