If it’s grandeur and opulence you’re after, look no further than this palatial Romanesque Revival brownstone, at 838 Carroll Street in Park Slope. Dubbed the Remington House, after the initial owner, who commissioned the house from architect C.P.H. Gilbert in the late 1880s, it’s got rich detail, acres of space, architectural distinction, a curved bay tower, and a price tag of $15 million.