The PhD thesis focuses on improving transparency in the non-listed real estate fund market. The research includes four studies: one on sustainability and performance, another on fee structures, a third on real estate debt funds, and a final one on leverage and interest rates. The findings show that sustainability commitments can impact performance, fee levels are driven by specific factors, real estate debt funds can be a valuable addition to an investor's portfolio, and leverage can affect interest rates on real estate loans. These results are relevant for real estate investors dealing with strategic issues in their portfolios.