Risk of Buying above Unknown Commercial Space

Hi - 

My wife and I love a a top floor condo in a 3 unit building. The second floor is owned by another tenant. The bottom floor used to be a boutique yoga studio, but the commercial lease is now up for renewal and it's unclear what will take its place (bar, restaurant, store, etc.) Is this a terrible idea to put an offer in? Everything else is perfect, but not knowing what the business will be is concerning to us and we're thinking of walking away. Any advice would be appreciated!

John