Better to sell while fully rented?

[David Weiss]

I'm thinking about doing a 1031 on a 4-plex I own, into a ski property for Airbnb in Colorado.  My 4-plex is fully rented, and worth more than I what I paid for it.  It brings in pretty good income.  Will I get a better price for the property fully rented, or should I let the leases expire and sell empty or partially empty?  I want the best possible price for the property as I'll need all of the profit for the ski property.