Flatiron Building, Mixed-use timber building in North Portland, United States.

The Flatiron Building, also called Ringlers Annex and Espresso Bar, is a two-story brick building with a triangular footprint at the end of a triangular lot bounded by West Burnside, SW Stark, and 12th Streets in downtown Portland. Its narrow wedge shape fills the corner, and its ground floor is occupied by a McMenamins pub.

The Flatiron Building is a two-story structure with a triangular footprint, built on the wedge-shaped lot bounded by West Burnside, SW Stark and 12th Streets in downtown Portland. It was designated a Portland Landmark in 1988 and listed on the National Register of Historic Places in 1989. At its opening it was promoted as the "smallest commercial building on the West Coast".

The building's name comes from its triangular footprint, like a flatiron, at the fork of West Burnside, SW Stark and 12th Streets. A McMenamins pub now occupies it, and the pub calls the fishbowl-like main floor and mezzanine a tiny window on West Burnside. Earlier tenants included a catering kitchen and a talk radio station.

The building fills the wedge where West Burnside, SW Stark and 12th Streets meet, so approach from the Burnside side to see the pointed end. The McMenamins pub occupies the two floors, with a fishbowl-like main floor and a mezzanine above it for watching traffic on West Burnside.

The building's triangular footprint, at the fork of West Burnside, SW Stark and 12th Streets, means it has three sides rather than four. When it opened it was promoted as the "smallest commercial building on the West Coast". Over the years it has housed a catering kitchen and a talk radio station.