The self-storage industry has three times the footprint than McDonald’s.
Or:
The self-storage industry has three times the footprint of McDonald’s.
The self-storage industry has three times the footprint than McDonald’s.
Or:
The self-storage industry has three times the footprint of McDonald’s.
The first needs a fix:
The self-storage industry has three times more footprint than McDonald’s.
The other is correct and - as Professor Lawler says - simpler.
Z
is OK, and quite common. Using three times more just raises the question of whether you're talking about 3X or 4X, plus it requires comparative syntax, which is very fussy.
Commented
Apr 24, 2015 at 18:18