Key legal question
Whether the public-law appeal was admissible against the cantonal judgment and for both appellants.
Extracted holding
The appeal was admissible in principle, but only A.________ SA could challenge the merits; B.________ AG could complain only about denial of party rights and was otherwise inadmissible.
Extracted reasoning
The suspension of the building-permit procedure could amount to denial of justice and irreparable harm. However, only the applicant with procedural standing in the cantonal proceedings could argue the merits.