The entrepreneur - who sold his big data company, Autonomy, to HP in 2011 for £7 billion - made his remarks during an hour-long interview with business website Leaders In.
The Ukip leader has campaigned against the institution for many years, but he insisted his hostility is towards the EU, not the member states.
UK equities, which are also sensitive to Brexit risk, have proved remarkably resilient. The FTSE 100 Index, the main gauge of UK stocks, is up more than 11% since February 11.
Tenant demand remains strong, however, in the mainstream rental market (one and two bedroom properties) with void periods down to just 23 days.