Plumbing Issue with a rental property

[Joey Fontenot III]

I recently put a new tenant into a rental and she called about excess sewage spewing into the tub when the toilet is flushed in one of the bathrooms. In addition she stated the washer was not working quite as effectively. The house is a 1950s property on city sewer and water. I am thinking that prolly the pipes have been stopped up and they need to be snaked. There are no trees on the lot, so I dont think that roots are busting through, but who knows. If you were in this situation would you call roto rooter or an actual plumber to fix the problem? and is there a way to prevent this problem in the future?

Thanks