Determine or knowing your State Plane Zone (coordinate system) is first thing before you open Arcgis Pro.
Every city using different state plane zone coordinate system. For federal agency because it is nation wide, WGS 1984 is commonly used, which is same as online map( such as google map, esri arcgis online map, bing map, apple map, mapbox ). But for city and county, all using different state plane zone.
Let's find out what coordinate system you should use for city of Los Angeles
https://transparentgov.net/json2tree/datahub.io/usgs/search_widget.html?backgroundlayerurl=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2Fcoordinate_systems%2Fstate_plane%2FMapServer%2F0&layer=State_Plane_Zones&_center_zoom=8&_center_lat=32.65009709043994&_center_long=-87.38609249899996
https://transparentgov.net:3200/googlemaps271/default?layer_id=0&layer=State_Plane_Zones¢er_lat=35.00159049751176¢er_long=-115.93637311377628¢er_zoom=7&url=https%3A%2F%2Fgis.la-quinta.org%2Farcgis%2Frest%2Fservices%2Fcoordinate_systems%2Fstate_plane%2FMapServer&overlayType=overlayType_image&dynamicLabelField=customlabel&panto=0&dynamicLabelFieldArray=2%2C3%2C4%2C8%2C9