And do you see developers begging to build 20 story residential in Chelsea? 5 over 1, sure, but not 20 story.
I don't pay much attention to Chelsea specifically. The 18-20 stories matching an 11 story lab is specifically about comparing them on size/height. However, there are 18-20 story residential buildings popping up all over the city so I don't think economics would preclude those in Chelsea. Since Chelsea appears willing to allow buildings that size, albeit currently a different use, it leads me to believe that 18-20 story residentials might be in their future.