On the home page of its website, New York City-based investment firm Blackstone estimates the value of its global real estate portfolio at $329 billion. The portfolio includes valuable property in downtown San Francisco, such as 45 Fremont St., a 34-story office building a block from the city's new transit center.
According to the San Francisco assessor's office, in 2017 the land at 45 Fremont was valued at $48.2 million and the structure was valued at $183.8 million — a total of $232 million.
In 2017 Blackstone purchased 49% ownership in the property from insurance giant Metlife for $233 million, meaning the market value of the entire property at that time was roughly $475 million — more than double the assessed value. Shorenstein Properties maintained its 51% ownership share.
The reason Blackstone purchased 49% is simple. Under California law, if ownership of 50% or more of a commercial property changes hands, it triggers a reassessment and property taxes based on the purchase price.
Buying less than half the property allowed both Blackstone and Shorenstein to avoid what would have been a costly update to their tax bills for 45 Fremont.
At the assessed 2017 value of $232 million a year, the city's tax assessment on 45 Fremont is $2.8 million. If the tax had been recalculated based on the $475 million market value, the tax bill split by Shorenstein and Blackstone would have risen to $5.5 million.
So by avoiding the 50% ownership trigger for reassessment, the owners save roughly $2.7 million a year in property taxes. Or put another way, San Francisco loses $2.7 million a year in taxes — and more than $8 million since that 2017 transaction.

