Existing Concrete Slab Demolition

Hi All,

I have an Eichler with the original exposed concrete floor slab. I am trying to do a new master bathroom with floor tile, but I do not know what is the best way to make a flush transition from existing concrete to tile.

Is the only way to demo out the existing concrete at the master bathroom before laying tile? Or possibly micro-floating a thin layer of new concrete over the existing concrete to match the higher tile flooring? Also, is there a way to patch the existing concrete floor and have it visually blend in (so the patch is invisible)?

Any help or advice would be much appreciated!