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Split the game across multiple tables. The only thing you need in the center is the galaxy, which fits on a 3'x3' card table. Amazon A 6'x2.5' table is a good amount of space for player areas. Amazon About $65, and you're ready for not just TI, but practically any game, and then fold up your tables and put them in a closet.
As far as what I personally play on and recommend, I have a counter-height 4'x4' square table as my dining table. Amazon I add to that - and keep drinks off the table - with a set of folding tray tables.