Co-op owners got together Sunday in their old haunt atop X2O Xaviers on the Hudson to chat about the year’s hottest topics — reverse mortgages and criminal background checks — and to revisit a few evergreen ones — tax abatements, boiler replacements. There was nary an N95 mask in sight, just the sun glinting off the river and an operatic view of the midtown skyline in the distance. more