Rachel1010, sounds like the yard man gave you some great advice! The history sounds interesting. Glad to hear you are there to stay. Now is the time to as Tiffany stated take the app and learn. The previous owner didn't think about selling or dying if this wasn't mapped out. Sorry! You might want to put an ad or flier out that you want these plants to go to good homes. I bet folks will flock there to get them, this way you know they will be going to good homes if you want to get rid of them. Then when you have them gone it's the time to make the property yours own, that is pretty much what the lawn guy is saying. It would be a loss to the community. I know it's important to some and the community. But I also understand progress and making it your own. The stories I can tell you will make some upset, you are not alone.
Thanks for the added information. It sounds like the grass wasn't important to the previous owner who did trees propagation.
