Jason Chaffetz, R-UT who resigned this week has suggested that housing for the members of Congress is sorely lacking to the point that many of them end up sleeping on cots in their offices. Some buy houses in DC although this leads to charges that they no longer really represent their constituents back home all that well and this has gotten a couple of them unelected. Chaffetz suggests a housing allowance of $2500/mo to get the members a place to live while they're in DC and makes the case that this would probably cost less than 1 airline ticket/week to visit home. It would also make working more than 3 days a week more achievable.
Here's the opportunity: Someone in the high rise construction / real estate biz could build some high rise condos in the DC area, and get a contract to house Senators and congressmen at say $2500/month. This would be included in legislation to require all Senators and Reps to live there while they hold the office.
I would put the 2500 sq ft units on the lower floors for the Reps, the 3500 sq ft units on the upper floors for the Senators, and some 1400 sq ft units in between for indispensable staff and "secretaries". This would probably call for about 1000 total units. To reduce any rancor, the builder would NOT be allowed to put his name on the outside of the buildings in 20 ft tall gold letters.