WI: Congress Moves in the 1920s?

In 1921 the House of Representatives would have increased to 483, but instead it was capped at 435 due to lack of physical space. And that some members might have lost their seats.

What if Congress decides to move to a larger building instead?
It would allow more room and include all the latest 20th century conveniences from the start instead of having to trying to modernize a 19th century building.