On the idea of pub tiers, something like:
Level 5: Pub
You have a small establishment that people in the local neighborhood frequent. It's cramped, but friendly. (More than 10'x10', but not a lot.) You can collect rumors of the local neighborhood (assuming it's in a larger city), and get advantage on Investigation rolls to track down specific individuals in town.
Your pub can also occasionally get a "taster" of some specialty concoction. This potion is selected from the UA list, and can last 1 minute when quaffed.
Level 9: Bar
At level 9 you can upgrade your pub to a bar, which is decently roomy. You're more widely known, and can get help from people who know people, in order to track down creatures in the city or nearby towns.
Your bar also has "local specialty brews", one of which provides magical benefits. Select from the UA list, but the potion only lasts 1 hour.
Level 13: Tavern
At level 13 you can upgrade your bar to a decent-sized tavern. This gets all the full benefits detailed in the UA.
Level 17: Cantina/Cabaret
Some combination of the Tavern and the (burlesque) Theater.