Bar Esper opened Wednesday at 401 Taylor Street in the Tenderloin, taking over the former Jasper's Corner Tap space inside the Hotel Spero. The concept bills itself as SF's first Portuguese-Japanese restaurant — a combination that has a real culinary logic to it: both cuisines share a deep history, going back to the 16th century when Portuguese traders introduced tempura technique to Japan.

The operator has not been identified publicly at this point, but the room itself is familiar to anyone who drank at Jasper's Corner Tap, a hotel bar that ran for years before closing. The Hotel Spero, a mid-market property that has cycled through several food-and-beverage tenants, now has a concept with a more specific culinary identity than its predecessors.

What exactly that looks like on the plate — whether it leans into the historical overlap between the two traditions or plays the fusion angle more loosely — isn't yet clear from the available information. The name Esper doesn't obviously signal either cuisine, which may be intentional for a hotel bar that needs to serve guests who didn't come looking for a specific culinary thesis.

What the opening does signal is that operators are still willing to take on hotel restaurant spaces in the Tenderloin, a neighborhood where foot traffic is unpredictable and the customer base is split between tourists, residents, and the after-work crowd from nearby civic buildings. A hotel address provides a floor of built-in covers that a standalone spot on the same block wouldn't have — which is often the difference between a concept that survives its first year and one that doesn't.