Good question, short answer: lots of legwork. It sounds like you are interested in ROI (return on investment) with regard to a rental condominium. This information is available from the current owner. You would ask for a profit/loss statement.Some condotels that are actively managed by a company would have current occupancy rates. I would call the front desk of the condo buildings of interest to check on their willingness to share the information. In Ormond Beach, well-kept properties tend to have strong rental histories.