If you don't have the time to run the business yourself, what do you possibly have to lose? Unless you are thinking of selling. Decide how much rent you need to make owning the property worth your while and advertise. Also, you may have a certain affection for the garden center idea, but don't close yourself off to the possibility that someone would want to run a different type of business there. If you can take down the greenhouse structure, advertise your flexibility. If you think at somepoint you will have more interest in the nursery business again, it may almost be better to have a different type business there. What if the renters business fails. "Under New Management" signs don't go a long way in erasing the memory of lousy selection, service, or an obviously floundering business in my opinion. Better to bring in a dog groomer, for instance, and when they move on you can truly start anew. A nurseryman also might be interested in knowing what type of profits you have made. If your heart hasn't been in it, you may want for bargaining power. Are you prepared to list off your shortcomings and hope they don't spark off doubts within that perspective businessperson, i.e. will I be able to find employees that want to invest in learning about plants?

It would not surpise me to see some takers, but expect those types who have a little back yard business, and want to make the next jump up, without risking a lot of capitol in the structures and equipment. Nothing at all wrong with that, btw.

I do not think a 20 x 30 greenhouse is very appetising, however, for anything but a rather small holding house for buying in somebody else's already grown annuals. I really believe it wouldn't be worth throwing anything but emergency heat to for keeping the frost off during bedding plant season. You couldn't grow enough in one to make the investment of heating it pay you back for the effort in anything but transitional selling seasons. I see it more as a road-side multipurpose market. Fruit/eggs/farm products and plants as a side-line. I know somebody who has almost exactly the same set-up and do a thriving business, but they are farmers who do some bedding plants on the side.