<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by monahos:
Try the Shinjuku Prince hotel, about 10 minutes walk from the Hilton.
None of the hotels (Park Hyatt, Keio Plaza, Hilton, Century Hyatt) on the metropolitan government building side of Shinjuku are affordable.</font>
The Keio Plaza was an Intercontinental until late 2002 or thereabouts. It seems like the price has dropped significantly since then. You might want to check the current price on Expedia or something. It was quite nice while it was an Intercontinental and may have come down a lot in price.