Silent disc floated over hill, stopped over pier restaurant, circumfrances lights lit, rotated for approximately 10 minutes.

It came over the hill from the east with a red and green light, similuating an airplane.  It floated down over the pier restaurant, and hovered.  The red and green lights extinguished.  White lights along the circumfrance lit (they may have been portholes, and the interior was illuminated).  The ship rotated for several minutes.  Rotation stopped, circumfrance lights extinguished, red and green lights re-lit, and the ship tilted, moved across Puget Sound westerly, then northerly, out of sight.  Silent operation.  Many pedestrians glanced at it and acted as though it was not there.
Date is approximate.  PD