RDI Reit's share price has plunged 18 per cent in the past two days. Investors are concerned about the UK property retailer’s ability to pay back its debt. Another property company making investors nervous is Fortress B. That stock is among the biggest losers on the JSE today after ratings agency Moody's downgraded it further into junk status. CNBC Africa spoke to Evan Robins, Portfolio manager, Macrosolutions and Steve Brown, CEO of Fortress.