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"About 190,000 new homes, parkland or even a factory could replace Heathrow Airport in west London if it closes, designs unveiled by architects show.
" 'Heathrow City' designs have been commissioned by Transport for London and backed by Mayor Boris Johnson who wants a Thames Estuary hub airport.
"Mr Johnson said Heathrow redevelopment was needed given the demand for homes.
"The government-appointed Airports Commission will decide in 2015 on whether an estuary airport is feasible.
"The Heathrow City plan envisions the future if the commission rejects plans for a third runway and selects the Thames Estuary option."