Is there any long term parking option in White Plains?

Well, there is long term metered parking available at the following lots: Chester-Maple which is behind Mamaroneck Avenue, Hamilton-Main, which is across from Walmart, Lexington-Grove which is the Galleria Mall's lot
White Plains Center Garage, which is the City Center parking garage and Longview-Cromwell. There is also the popular train station lot.

However, those are typically up to 24 hours. If what you are looking for is long-term, long-term, lol, then I personally don't know of any lots other than the one at the Westchester County Airport.