Deceased (and desiccated -
weighed less than the paper towel I used to retrieve it.) Found in a little-used basement area. Second find of one of these in this general area of the building (the last one was doing the breast stroke in a toilet, and was released.) Others have been spotted on the wing, both indoors and out, but not in recent years.

(Quick and dirty photos with a borrowed cellphone. The photos will be supplemented later with better ones. Dorsal fur is much browner than appears here.)

Updated.