The Porter building is a good example of Second Renaissance Revival architecture. The commercial ground level is surmounted by a colossal order two stories high. Slightly projecting corner bays with their rusticated quoins add a stability to the building. The whole composition is topped off by a heavy bracketed cornice large enough to successfully blend with the building below.

The building is built of tan brick accented by white terra cotta Renaissance details. The heavy console brackets, keystone, and balustrade at the lobby entrance are especially well handled. By showing a distinction between the commercial ground level and the upper level offices, this style is especially well suited to commercial office development such.

Excerpted from the NRHP nomination.

The NRHP nomination did not mention the architect, but according to Wikipedia and other sources, the Porter Building was designed by William H. Weeks.