Philcade Building, Art Deco commercial building in downtown Tulsa, United States

The Philcade Building is a 13-story commercial structure in downtown Tulsa with buff brick exterior and terra cotta facing on its lower three stories. Retail establishments occupy the base while office suites fill the upper floors, all connected through a central entrance.

Waite Phillips had architect Leon B. Senter design the Philcade, begun in 1929 and completed in 1931 opposite Phillips's Gothic Revival Philtower. Phillips first planned six stories, then nine, then thirteen. Standard Oil subsidiary Stanolind bought it from Phillips in 1942 and renamed it the Stanolind Building; later names were Amoco North Building and 501 Boston Building. It joined the National Register on September 18, 1986.

The name Philcade combines the owner's surname, Phillips, with the suffix -cade, as in arcade. The lobby's marble pilasters carry a plaster frieze covered in gold leaf at the mezzanine, and bronze filigree chandeliers hang at the centre of each painted ceiling panel. The entrance columns stop at a terra cotta beam bearing a crest with the initials "WP" among carved vines, fruits and flowers.

The tunnel beneath 5th Street, built in 1929 and 80 feet (24 m) long, linked the Philcade to the Philtower, but the door beneath the Philcade is now locked at all times, so this segment is closed to the public. Enter the building from South Boston Avenue; the decorated lobby and mezzanine are the parts to look for.

The top floor holds a spacious penthouse with numerous rooms, added in 1937 as a private residence. The Phillips family moved into this luxury space after leaving their previous mansion.