CS REF Siat: Investment yield falls to 6% The CS REF Siat real estate fund generated a return on investment of 6.0% in the 2019/20 financial year after 7.6% in the previous year. 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