During my upper east side adventure last weekend, I went to Sunday Mass at a parish that was conveniently located literally around the corner. St. Monica's church building was begun in the 1880s and completed in 1906. It's in a pretty standard Gothic revival style, but the decorative elements are exceptionally good.
Thanks to recent renovations, the interior really sparkles. The freestanding altar is obviously a post-Vatican II addition, but it complements the original nicely.
The stained glass windows were one of my favorite parts. They seemed very L. C. Tiffany-esque, with their intricate detailing and the soft edges of the pictures. I wish I had had time to photograph all of them.