As Lorinne suggested, clearly knowing what you have, and has obviously been working the last 20 years makes sense.
When you ID what is already there, it will create a blueprint for what and how to replicate, if anything.
Check out Bat International -
https://www.batcon.org/
There is likely a local Audubon group that would be happy to supplement your knowledge for attracting and keeping ideal bird species.
And of course, your neighborly leanings are important. Does your neighbor know about your plans? They might actually be an asset if there is something they can gain from your project.. ie bird watching, less mosquitoes becasue of bats and birds, not to mention a few bushels of delicious homegrown fruit, etc...