The Park Road driveway to Sen. John Rockefeller’s Crestwood estate.

Yesterday, the Post’s Reliable Source zeroed in on the homes owned and rented by some members of Congress, amongst them Sen. Ron Johnson (R-WI), who owns a 2,430-square-foot house on Capitol Hill worth $1 million.

That’s impressive and all, but it’s nothing compared to the Crestwood estate — not house, but estate — owned by Sen. John Rockefeller (D-WV).

Rockefeller purchased the seven-bedroom, 21,000-square-foot home located at 1940 Shepherd Street NW in 1985 for $6.5 million, which was at the time the most anyone had ever paid for a residential property in the city. (In 1993, the Brady Estate in Foxhall, which had been originally offered to Rockefeller, was put on the market for $27 million.)

In 1989, Rockefeller refinanced the house for $15.3 million, a cost that was attributed to substantial renovations. At the time, a Post reporter guessed that his monthly mortgage payments came in at $134,000; average payments in the District at the time only reached $1,200.

For 2012, the home’s assessed value came in at $16.5 million. Rockefeller’s personal wealth is estimated at $100 million.

The home, which sits on 15.9 acres of land bordering on Rock Creek Park, was originally built in 1926 and remains one of the largest single plots of land used for housing in the District. (A 1986 city report claimed the land it sat on was 92 times larger than most similarly zoned residences.) It was termed “The Rocks” when it was first built; how appropriate for Sen. Rockefeller, right?

Not only does Rockefeller have a huge house on a huge plot of land, but he’s got a convenient shortcut out. A long driveway comes down the south side of the estate, connecting to Park Road. Oddly enough, the estate has two addresses — 1940 Shepherd Street NW and 2121 Park Road NW, the latter of which is listed as the mailing address. Even more oddly, the private driveway, which predates Rockefeller, cuts through a narrow stretch of Rock Creek Park, which is federal parkland. I’ve dug high and low and still can’t figure out how the driveway came to be, but it remains impeccably plowed, even if Park Road isn’t.

So, yeah, Sen. Johnson, how fancy do you feel now? Your entire house would fit comfortably inside Rockefeller’s — a few times over.