It was not a midseason game. The 16 game win streak was broken by the Suns in the last game of the season, 1991.
Both the Lakers and Blazers had 16-game win streaks in the 1990-91 season. Los Angeles Lakers 16 Jan 9 Feb 5 Lost Finals Portland Trail Blazers 16 Mar 20 Apr 19 Lost Conf Finals
I was thinking of the combined win streak between the 99-00 Blazers and Lakers. Both teams had a double digit win streak at the time.