Waging a public battle against your rich neighbor with obscene tech money is practically a Bay Area tradition. In David Cowfer's case, his angry website about an invasive species of Silicon Valley billionaire practically wrote itself. Cowfer is fighting plans to turn a six-bedroom family home in a sleepy cul-de-sac on a picturesque Glen Park hilltop into the ultimate bachelor gymnasium, including a basketball court, lockers, sauna, wet bar, lounge, and a cantilevered swimming pool. Plans also include a two-story garage door with glass panels will roll open to show a spectacular view of San Francisco — and could cause a spectacular nuisance for Cowfer, who lives next door.

The house, which sold for $2.35 million in 2015, was purchased under an anonymous LLC. So it took Cowfer nine months to figure out that the baller behind the renovation was prominent venture capitalist Keith Rabois, a Silicon Valley veteran with a contrarian Twitter account and a Stanford pedigree, who, like his buddy Peter Thiel, is also part of the so-called PayPal mafia.