Spurs have been available for some time. Was a rumour that Facebook were interested awhile ago
Now saddled with a debt approaching £1B It’s not going to be easy
It's a cliche but any football club* (any company for that matter) is for sale at the right price.
I'm not sure that Levy especially wishes to sell his shareholding (c. 25%) but it is very possible that Lewis feels that ENIC have taken it as far as they can and reached a point of maximum ROI.
* With the exception, perhaps, of clubs owned by the fans.