Thanks! It lost a sprig of Maranta - not a great surprise.
Library. Very dry air, inappropriate unseasonal temperature swings, but lots of bright artificial light and sometimes brief sunlight from a skylight or window. The dry air makes it hard to overwater. We may be closed more weeks now, I am hoping my management will throw them outside and let me just bring them home. But considering everything, if they don't , and the plants don't survive, that's minor.
A local hospital has some really enormous and healthy looking things in a waiting area. Philodendron? Huge spathiphyllum? I forget what all. I hope I have no reason to go there for a long time, too.