The firm said: “In our judgement, the London commercial property market currently provides the best source of potential capital profits and we expect this to remain the case for the foreseeable future.”
Helical currently has four ongoing schemes in London with £120m of remaining spend to reach completion.
The developer is also on-site at an office scheme in Manchester and four retirement villages across the country.
Chief executive Gerald Kaye said: “We believe our concentration on offices and mixed use assets in London, offices in Manchester and well located logistics units will provide capital growth from development gains and rising income streams.
“We have ambition to continue to grow the Company and have actively sought to add to our development pipeline with exciting new schemes, particularly in London.
“Rebalancing the portfolio through the sale of non-core assets enables us to recycle some of the value we have created in recent years and fully pursue those opportunities that we have identified.”