David Smith, head of sales at Mulgrave Properties which has seen a 60 per cent increase in sales in 2020. A YORK-based property developer has seen a 60 per cent increase in sales in 2020 with demand in the city continuing to rise. The government’s stamp duty holiday has helped keep the property market buoyant this year, leading Mulgrave Properties to extend that offer to include all of its properties available for completion before March 31, 2021, not just those under £500,000. The move, designed to ease the financial pressure on those looking to buy larger properties, has already seen a positive response, with purchasers saving thousands on their new home.