St. Margrethen: Hiag sells site to Stadler Hiag Immobilien Holding sells a 66,000 sqm site in St. Margrethen (SG), which it had previously ceded under building rights, to Stadler. You need to be logged in to view this content. Please Log In. Not a Member? Join Us Annual subscription "IB+ Database" CHF 95.00 incl. VAT Add to cart