Kernrechtsfrage
Whether the public law appeal was admissible despite the parallel ordinary remedy and the challenge being directed only at allegedly arbitrary application of federal contract law.
Extrahierter Entscheid
The appeal was inadmissible because it in substance raised only issues of federal law that had to be pursued by reform appeal; Article 9 Cst. added no independent ground.
Extrahierte Begründung
Public law review is subsidiary. The arguments attacked the interpretation of 'without commitment,' the formation of an architectural contract, and SIA tariff rules, all of which concerned application of federal law rather than a standalone constitutional violation.