New investment link-up to have opportunistic strategy. : The Teacher Retirement System of Texas is giving Greystar Real Estate Partners $200m (€167m) to invest in US apartments. The pension fund told IPE Real Estate that it had formed Greystar TT as a limited partnership to invest opportunistically across the US  Greystar, which declined to comment, will buy existing value-added assets and invest in development projects. Greystar has renovated more than 12,000 apartments around the country and its return on cost for these assets has been 26%, according to a board meeting document from the South Carolina Retirement System Investment Commission.