tilasidosten

Could you clarify what tilasidosten refers to? I can’t locate a widely recognized definition for that exact term. Is it a Finnish legal concept, a term from urban planning or property management, a historical idea, or a fictional/placeholder term? If you provide a definition or context, I can draft a concise, neutral encyclopedia-style article (under 300 words). If you’d like, I can also create a fictional, wiki-style entry for tilasidosten.