Hmm... in my mind it was still with Hilton! But I guess that hasn't been the case for like 6 years! I'd think they must be affiliated with one of the loose programs, like Tablet (though I don't believe they're part of Tablet). No references on their website. Would guess not. Not sure I'd be keen to stay there in any case.
Indeed, no points program. Though not a place I'd optionally return to, it was not bad for a mid-scale (upper mid-scale?) conference hotel.
I stayed there twice, it was a Hilton both times. But that was over 6 years ago. I had no idea they were no longer Hilton. Thx for pointing that out.