How did all my residential units get ungrouped?! Dammit!

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How did all my residential units get ungrouped?! Dammit!
The rendering starts on the side of the scene you already know, then slowly works all the way around the only part you really updated and want to see.
We're designing what is basically a biggish bus stop. ... Our model is 30 miles of the entire bus system. ... WHY.
revit problems: typing 'wt' into your schedules by accident