"I agree. Sadly, even Pevsner's heirs gave this mediocre architecture only a hurried,cursory glance and right up Missing two important things (one a real buttress and some fenestration indicating 16th/17th century original work and I suspect some 1st generation English Palladianism too. It is clear to anyone with any practical knowledge of building and structural engineering that those pilasters (best word I can think of for them) are not buttresses - they are a decorative feature. They are not high enough to be buttresses; they do not protrude enough and they are in the wrong place for a strain to be occurring - especially just 20 years after the facade was originally completed. They are clearly meant to complement the portico - which they do quite well. There is some quite fascinating interesting architecture here, and I fail to see why it can't be mentioned because some people never bothered (or were deterred) from looking for it.    (talk) 

 Architect 

In hopes of identifying an architect I checked Colvin: no listing for Tracy Park. "