"When they finish the Second Avenue Subway, this apartment will quadruple in value." [0] Mad Men had real estate agents promising the subway in 1965. Of course, the US$28k apartment in question is now worth about US$1MM, so it's true that the value will quadruple -- times at least ten.

[0]http://videos.nymag.com/video/Mad-Men-Takes-on-the-2nd-Avenu... Men' Takes on the 2nd Avenue Subway