Property line in back yard / new landlord owner occupied

[Julio Salado]

Hello,

I just bought a two family ( first time home buyer/owner occupied). I learned that a few of our neighbors have extended their backyard property line about 5-8 feet. We all have a public bike path behind our houses too. I’m thinking of aligning my fence with my neighbors but prior to do so, should I pay for a professional land survey?