Large building type UFO that is tall but rounded, never heard of sighting of a UFO like this one.

I believe the year was between 88-90 roughly. I was around 11 or 11 years old I believe and was with my 2 younger brothers roughly 4 and 8 at the time.  My mom and dad were taking us through the drive through of Burger King in Ellenville NY to get some food late night after visiting family members.  We saw a huge what I would describe as a building in the sky that was rounded but tall, several stories high with many lights/windows.  Besides me and my family seeing this, the girl working the drive through window also looked out and saw it, it was not like anything I have ever even heard of and have not seen anything else online about UFOs that look like flying buildings but it was unmistakable. Ellenville is around 12 miles from Pine Bush where there are many UFO sightings and also where I would have my second sighting of a UFO around 2001 or so that was more up close and I will post the story online here separately.
Witness indicates that the date of the sighting is approximate.  PD