(of a building) allowing access to the upper floors by stairs only; having no lift

a walk-up hotel

denoting a travel fare or ticket at the price charged for immediate use rather than at the lower level provided when a customer makes a reservation in advance

the one-way walk-up fare from Baltimore to San Francisco

online reservations are recommended, as there are limited walk-up tickets available

a building allowing access to the upper floors by stairs only

a studio apartment in an ungentrified walk-up