Mayor Bill de Blasio has found the ideal campaign headquarters for his improbable presidential bid — a converted vacuum factory that specializes in short-term leases and is a quick walk to his Brooklyn gym.

The term-limited pol’s scant campaign staff of just five people has parked at The Yard, a co-working space between Park Slope and Gowanus on 13th Street, sources told The Post.

De Blasio had said on NY1 Monday, “Look, this is like a startup, it really is.” He confirmed that the offices are in Brooklyn, but refused to divulge the address.

Maybe because the HQ is nothing fancy. It’s a space where struggling freelance writers and other under­employed creative types sit elbow-to-elbow at white desks.

A plus of The Yard — a WeWork rival with several locations on the East Coast — is the lounge where the mayor could take one of his regular siestas if he’s feeling sleepy after his morning workout at the nearby YMCA.

For de Blasio, who’s begging for $1 donations via Facebook to jumpstart his fledgling campaign, the price is right.

A spot at a shared desk is $295 a month and private offices start at $600 a month.

There is no long-term lease and tenants pay month to month.

Campaign spokeswoman Olivia Lapeyrolerie downplayed the meager new digs, saying, “It’s just an office space.”

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The campaign team was absent from The Yard Thursday as they attended a union rally in Des Moines, Iowa, where the mayor said he and his staffers are going to boycott McDonald’s until the fast-food chain pays a $15 minimum wage to all its workers.

De Blasio also bragged about getting a $15-an-hour minimum wage implemented for government workers in the Big Apple.

However, Gov. Andrew Cuomo’s camp has also taken credit for the move — which required state approval.