I think it is a lawyers term...lol. ..I have never been in the hole deep enough to see it...lol
We did get to test a drilled cassion in sand..It was cool..drilled two other piles and put a beam across with a jack...It didnt move .25" with 200kips of pressure on a drilled pier only 20' deep..hard to believe a driven pile 90' deep couldn't hold its 200kip design load..
Obviously the building is safe..and it is hard to believe the 16 inches of settlement. .wouldnt the sidwalk collapse. ..utilities break? Being 2" out of plumb in 600' is no big deal..I had some Irish carpenters build a four story condo on California at Arguello. .It was 4" out plumb...they didnt keep aligning and bracing as they went up...couldnt get it back plumb...Still there after 34 years...I witnessed another condo building that was 2" out of square...happens all the time..I check houses for levelness all the time..2" out of level is very common. .A lot of builders cant get them within an inch of level..Code allows for a tolerance of 1" in 30 feet..so a 60' long building with 2" of differential settlement is acceptable by code.....Beside all buildings move a bit, soil settlement is a fact of life...Most houses are on shallow footings...they settle over the years..Some move seasonally...due to expansion in the clay..
I lived in a 500 year old farmhouse in England in 1966..the floor under my bed was 8" out of level..took three bricks to make the bed level...been moving around for 500 years in expansive farmland clay....still standing
BTW highrises are designed to handle lateral movement up to 1" per floor...thats up to five feet for a 600' building...
So far the Millennium building has only moved 2".....I will buy in when they drop the prices to $100k ..can still get $6000/m rent... great cap rate..