No dig pipe repair from roots in pipes damage advice needed

[Ben Gammon]

I pulled roots out of my pipes!(see pics below)

Thanks in Advance for any and all input!

I have a 60 year old? Oak Tree right behind my four unit building and the crappy thing is that it's roots are in my pipes. As ****** as it was to discover this 12 hours before I was supposed to board a plane I successfully used my big boy auger to cut and pull the roots. The pipes were additionally clogged with a rag and surgical mask that likely got down the pipes during a flood. After pulling the roots I was sure to wipe the the butt end of the auger several times to make it clean. The roots seem to be 10 feet behind the building directly under the big oak tree and on the way to the city sewage connection that is 20 feet from the building. The building was built in 1961 so it is likely a clay pipe. 

What's the best way to manage this? 

A) Manage it: dump foaming root killer down the drain every 6 months and likely auger every 2 years? 

B) Replace it: dig up the entire pipe and replace it. Most expensive and would be a nightmare since I would have to dig up a concrete patio and a crap ton of roots

C) no dig pipe repair: Has anyone ever done this? Any got a guess on the ball park price? Any recommendations on local companies that do this?