That doesn't sound right to me (I've been in the YC network for 10+ years, as has dang), and is at odds with what tlb (an original and still-serving YC partner) said in this comment [1] above, and what has always been YC ethos.
Maybe the person who told you that was mistaken? Or it may have been a YC partner or staff member doing it privately?
So the investor holds the lease.