Just some experimentation with Esri-Leaflet. Basically, we have a feature service for our parcel data that is split into two layers: geometry and attribute data. The attribute data is a related table. Natively, Esri-Leaflet doesn't query data from a related table. Luckily Esri-Leaflet-Related exists. It's in beta and uses a release candidate build (I think that's the term) of Esri-Leaflet 1.0.0, but I was able to use it to pull data from the related attribute table and make it so that when the user hovers over a parcel (geometry), an info pane shows the parcel's address (related attribute table). When the user clicks, a table appears with more info about the parcel (related attribute table).
Updated missing url //rawgit.com/wenzhixin/bootstrap-table/master/dist/bootstrap-table.min.js to //cdn.jsdelivr.net/gh/wenzhixin/bootstrap-table/dist/bootstrap-table.min.js
Modified http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js to a secure url
Updated missing url https://cdn.rawgit.com/maptastik/esri-leaflet-related/master/src/EsriLeafletRelated.js to https://cdn.jsdelivr.net/gh/maptastik/esri-leaflet-related/src/esrileafletrelated.js
https://code.jquery.com/jquery-1.11.0.min.js
https://rawgit.com/wenzhixin/bootstrap-table/master/dist/bootstrap-table.min.js
https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js
https://cdn-geoweb.s3.amazonaws.com/esri-leaflet/1.0.0-rc.6/esri-leaflet.js
https://cdn.rawgit.com/maptastik/esri-leaflet-related/master/src/EsriLeafletRelated.js