The still unsteady economic environment has changed the way consumers spend money, prompting market adjustments by landlords, retailers, and restaurants. Ginger Perry, a real estate partner in the Phoenix office of Ballard Spahr, said that some landlords are being forced to fill shopping centers with tenants to meet agreements in other leases. Retail leases often include provisions that give existing tenants temporary rent discounts or the ability to exit a lease if a certain percentage of the center is vacant.