Landlord Deciding Not To Sell to Current Tenant

[Sharon Li]

My tenants have occupied my CO rental home for many years now, and over the years, they've repeatedly expressed interest in purchasing my property. We don't have a lease to own/purchase agreement in place, just a regular lease, and I've entertained the idea over the years. We've discussed potential purchase price and giving them some rental credit over emails, but never signed any agreements, and the conversation usually ended in them needing more time to secure funds. Last year, they approached me again and believed they were finally ready to move forward. At the time, I was still interested in selling, but the deal ultimately ended since they couldn't secure financing. They're currently under an active lease until this summer, and I didn't expect the topic to come up until then. However, they recently approached me and said they should be able to get a mortgage approval next month. I was a little surprised since they hadn't told me that they have been working towards getting approval since the last deal fell through, and since then, I've had some personal events come up, so I told them I'd have to delay the sale, but let's discuss later this summer. After a lot of thinking, I'd actually like to hold on to this property instead of selling. 

Do I have a legal obligation to sell? Again, there was never a "yes, I promise I'll sell," just that I'd be interested, and of course had entertained the idea several times in the past, to include discussing prices/credits, but no paperwork was ever signed.