To my knowledge -- and perhaps there are those out there with far better knowledge of the NYC building and public assembly codes -- the law requires no more than seven seats between the patron and the aisle of egress. Theatres like the Minskoff were grandfathered in when the new law took effect but certainly any new theatres or new seating configurations would be subject to this law. I was curious which other theatres also had a large number of seats in a row, and here is what I found looking at the seating charts on Playbill.com:
The American Airlines theatre has a crazy mezzanine that is 40 seats wide.
Circle in the Square has sections of 20+ seats.
The Gershwin orchestra is 18 seats wide.
The orchestra of the Marquis is 28 seats wide.
As you mentioned, the Minskoff is the winner with 30 across in the orchestra and an insane
50+ (!!) in the mezz.
The mezz of the Neil Simon is 27 across.
Studio 54 has over 20 seats across in both the orchestra & mezz.
The Winter Garden also has 20+.
"It's Phantom meets Hamlet... Phamlet!"