It's all AU.

The Doctor peered around the corner of a building, glasses firmly on as he examined the brick work. "I think it's bigger."

Reinette was on the top of a skyscraper. She'd never seen a skyscraper before - she'd never seen a city like this. She'd seen Paris, but Paris in the 18th century was nothing compared to this. Up there, on top of the world, able to see for miles, and city extending as far as she could see.

The Doctor had spent a week or so resting, making the most of the gorgeously soft bed he'd staggered into, and drinking tea from room service.

Eventually, he'd worked up the energy to get out of bed, get dressed, and venture out of his room. He glanced towards the restaurant as he crossed the lobby, but he couldn't quite face normal food yet. He'd go for a walk instead.

He opened the door of the hotel, and stared. He'd expected a quiet, sleepy little town. What he'd got was New New New New New York.