Occupying the 1st storey below the Yorozuya office, 'Snack Otose', or 'Otose's Snack House' is the name of a pub run by Otose. Otose also owns the whole building and is the landlady of Yorozuya. Otose usually send Catherine upstairs to collect rent from the trio, but in later episodes after 72, she would deploy Tama, after having equipped her with sufficient 'extra functions' (i.e. fire power) from Gengai. Whenever Yorozuya are unable to pay, she would have them work as cleaners in her pub to pay off their debt, that or the Yorozuya runs and comes back after they have the money.
It is mentioned throughout the series that Snack Otose has numerous patrons, including Gintoki and Hasegawa, both who frequently fail to pay their tabs.