US Edition In a relatively upbeat statement for the quarter to 30 June, he warned that despite the optimistic signals investors needed to "exercise great caution" as property values continued to fall as a result of declining rental values.
Mr Slade said growth in the capital was helped by foreign currency-based buying as well as increasing confidence.
"People are buying – they don't want to miss this opportunity – and that's what causing this spurt," he said.
He said he was seeing a levelling out of certain types of assets and growth was particularly positive in London's West End and the City, along with out-of-town retail parks.
But he warned that a full recovery was not imminent.
"It has been better in the last few months, but I can't see that it's necessarily going to get better and better," Mr Slade said.
"That's not being pessimistic, it's just being practical and pragmatic."
He added that he stood by his prediction made in June that we would see a 'www dot'-shaped recovery and would be unlikely to see any real recovery in the market for another two years.
However, Mr Slade, who on Wednesday celebrated the 25th anniversary of his joining the Helical board, remains bullish about the group's ability deliver value for its shareholders.
"After two years of market uncertainty, Helical is now firmly on the front foot with both its existing portfolio as well as in respect of potential opportunities," he said.
During the last quarter, Helical said it had completed 23 lettings, including 14 lettings in the Hub, Glasgow, increasing their annualised income by £356,000 .
Four tenants vacated their properties or went into administration, resulting in a £56,000 drop in annual income. Helical also said it had renegotiated £134m of debt.
Shares in Helical, which has risen 28pc since March, closed down 5.75 at 325.25p.