Is it safe to cut slab for connecting 2 flats?

It really depends on the base structure and the legal rights. Who owns the slab? Is it providing structural support of some nature? Do you need access to both sides to accomplish the work? If so, will the other party agree to access? If the economic value of either property impacted if the slab was cut or otherwise changed? Does the cut need to be sealed or otherwise treated after a cut to protect the slab and the possible steel in the concrete?

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