Need a ruling: 30 or 31 parks?

Shows you how much I keep up with the news.

It turns out, this is Shea Stadium's final season. I first went to Shea when I started school in New York in 1988, but I haven't been back since 1990. I hate Shea. It's uncomfortable, ugly, and the Mutts play there.

Only, I just found out they're tearing it down after this season, so next season the Mets will play in their brand-new Citi Field next door.

Now, I already knew about the new Yankee Stadium, and I'd decided that visiting the old one would count for this geas. So I guess I have two, mutually-exclusive questions:

1. Does the 30-park geas require me to visit all 30 parks that existed when the geas started this season, counting the five I'd already been to?
2. Or, conversely, does the quest entail visiting all 30 parks regardless of whether I've been there before?

Either way, which Shea counts?