Owners and boards have no obligation to find alternate housing for inconvenienced or disabled residents, said Steven R. Wagner, a real estate lawyer at Wagner Davis in Manhattan. But they must make “reasonable accommodations.”

“Part of the consideration of whether something is reasonable is the cost,” Mr. Wagner said. “Others include the duration of the work, the options available to the residents and landlord, and the effect the accommodation may have on other residents.”

Speaking from personal experience, I strongly advise single-elevator buildings not to economize on porter service. Arrange for daily coverage from early morning to late evening, with deference paid to the needs of residents of higher floors, the physically challenged and those with young children.

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