Yes, it seems to look like Treglown, but when I asked the lady at the Rockefeller Archives, by email, about this name she said there is no record associated with the Rockefeller family history. I thought it strange, as surely there would be some press coverage at the time; whatever JDR was doing at any one time it could have been observed and recorded. Maybe?
I wrote to a gentleman who left his email address on his website covering Greek Revival Architecture and he replied almost straight away that he cannot identify the house. He added that it is probably one of the Rockefeller properties, but he is not familiar with it. A quick reply maybe because it really is not on his list of Greek Revival Architecture. So, yet again no result. Ah well, maybe one day.