On Wednesday morning, a small crowd of New York City co-op owners rallied outside the ultra-luxury Midtown building where tech billionaire Michael Dell owns a $100 million penthouse .

But it wasn’t at all for computer issues. The 25-or-so attendees held up signs and chanted, “Save our homes!”

Just down the block sits Carnegie House. It’s the longtime home of many rally attendees — and one of Dell’s recent real estate investments. Residents of the co-op, known as the only remaining affordable building on Billionaires’ Row, are facing the looming threat of displacement from a 450% rent hike .

The issue is the co-op’s ground lease. Though residents own their apartments inside, they don’t own the land the building stands on — the ground lease owners do. 7

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While residents who

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