After completing five small jobs in a city (with the exception of Riften), Delvin Mallory will offer a special job to restore Thieves Guild influence in that city. These quests can be taken in any order. The city influence quests are necessary in order to complete Under New Management and assume the title of Guildmaster. (However, before completing them all, see the bugs reported for Under New Management.) Becoming Guildmaster allows access to the Guild Master's Tribute Chest.