The new coronavirus has emptied out cubicles and desks across America. Many of the buildings that house these offices, however, remain open to accommodate businesses with essential work to do.

This provides a lifeline for Elsa Romero, a 56-year-old native of Honduras who has been cleaning offices, homes and other facilities for 20 years. Ms. Romero, a diabetic, cleans two floors at the Miami Tower, earning the $700 to $800 a month in take-home pay needed to cover her expenses, including a bare-bones health insurance plan.

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