Numbers 15 and 17 and 19 and Attached Railings

Numbers 15, 17, and 19, along with the attached railings, form a terrace of four houses that have been converted into flats and offices. These buildings were constructed between 1824 and 1836 and feature pinkish-brown brick with painted stucco facades, a Welsh slate roof, and cast-iron railings.

The exterior consists of three storeys with basements, and the two leftmost dwellings have attics. There are eight first-floor windows, with the first floor displaying six-over-nine sash windows with sills throughout. The second floor has two six-over-nine sashes on the left, while the rest are six-over-six sashes, also with sills. The building includes a frieze, a cornice (which is missing above the fifth to eighth windows), a low parapet, and copings.

On the ground floor, to the left, there is an entrance with a six-panel door and overlight in a fluted surround with a cornice. The other entrances to the left consist of a three-panel door with an overlight featuring glazing bars, a six-panel door with an overlight, and a four-panel door with an overlight, all set in tooled architraves with shallow pediments. There is a six-over-nine sash window to the left, while the right side has canted bays rising from the basements, mostly featuring one-over-one sashes, except for one two-over-two sash. The basements have six-over-nine and six-over-six sashes, along with part-glazed doors. A roof dormer is present on No. 15, and there are ridge stacks.

The left return has six-over-nine sashes throughout, a frieze, a cornice, and a pedimented gable containing a three-over-six sash window.

Inside, No. 19 features a staircase with stick balusters, but the rest of the interiors were not inspected. The railings flanking the steps and surrounding the area have lancet and anthemion finials.

Historically, Portland Place was laid out between 1823 and 1824.