Is it reasonable for multiple parking spaces in the community to be shared on a first-come-first-served basis?

I don't think there is anything reasonable or unreasonable. Then, if the parking space is implemented on a first-come-first-served basis, it will be decided according to the situation at that time. Otherwise, if the parking space needs to be purchased, then your tenant still needs to buy it. Will you buy it? Or reply to pay parking space rent? So this is equivalent to saving your expenses in disguise. In order to adapt to your situation at that time, the property also implemented the decision of first come, first leave, because it would meet the needs of most people.