Really impressive! Stunning actually! I had the fun of seeing Bill Bramlage's layout in person north of Cincy. It too had a city scape that was almost beyond belief… almost.
If you have a chance to get to Chicago's Museum of Science and Industry, check out the HO railroad the emulates the route of the BNSF (sponsored by them) which goes from Chicago to Seattle. Chicago is done in full scale with the Willis (nee Sears) tower extending up at least 15 feet. You need high ceilings when you want to do these things.
Above the tower is the underside of a the wing of a Boeing 727 in 1:1 scale. Impressive space!
Amazing what you can do with an almost unlimited budget and lots and lots of room… Kind of humbling, ain't it.