Marketing the unmarketable space
The Journal of Property Management has a good article titled “Marketing the unmarketable: Difficult-to-lease spaces need special attention and unique marketing tactics”. 
From the article:
“You know how it goes: Your shopping center has a vacant space or two you just can’t seem to lease up. You planned to have the space leased this quarter, but time is passing and it just hasn’t happened. Merchants are dissing, brokers seem disinterested, and your owner is dissatisfied.”
The article goes on to give you four steps to help this issue including
- Deal with the curb appeal
- Make sure you understand the owner’s goals
- Network, Network, Network
- Market Creatively
It’s a quick one page read that may give you some insight into how a property’s productivity (or lack thereof) can be dealt with in the marketplace.