The tenants have a sidewalk sale to pay for the repairs needed to fix up 227. Lester asks Mary not to sell his aunt's old, ugly lamp, but she does anyway, for $5. When Lester finds out, he is upset, but for more reasons than one. The lamp is where he hid the profits of the sale.
The tenants get upset with Mary and outcast her. Luckily for her, the wife of the gentleman who bought the lamp comes by her apartment to give it back to Mary, because she did not like the lamp either. They buy it back from the couple for $50 and got the money back to save 227.
