@FBarizona1 ,
You can't just delete and grab. This page does not belong to you; it belongs to your former employer. In fact, changing the email address smells rather fishy to me and feels unethical.
Actually, I don't see why you or your marketing person feel this page has to go away at all. It's proof of your competence, readily available online. Attract those 1200 people like you would anyone - be great online. Nearly everyone on the planet realizes that people change jobs.
You can also, of course, get your leads elsewhere. 1200 is but a small drop in the Facebook bucket. You can send invites to those 1200 people (it'll take you a while) to ask them to like any new page you make - and make one which you control and is not tied to any employer.
That would be the ethical way to do it.