By Laura McGuire Great Portland Estates (GPE) has raised gross proceeds of £350m to capitalise on its pipeline of new opportunities in central London. Back in May, the London landlord launched a fully underwritten three-for-five rights issue to raise gross proceeds of approximately £350m – £336m net of expenses – through the issue of 152m new Shares at a price of 230 pence each. This morning, GPE confirmed it had received acceptances from existing shareholders in respect of 96.8 per cent of the new shares. The deal’s underwriters will place the remainder of the issue. The final figures will be…