Can someone please explain the difference between the following?

駅のまわりはとても賑やかになった

駅のまわりはとても賑やかになっていた

駅のまわりはとても賑やかになっている

Question

Can someone please explain the difference between the following?

駅のまわりはとても賑やかになった

駅のまわりはとても賑やかになっていた

駅のまわりはとても賑やかになっている

Answer

1st sentence: 
It states the fact.
2nd sentence:
The person said this went there to see it and now came back. 
3rd sentence:
The person said this is still there looking at it now.