Sun Hung Kai Properties (SHKP) has filed an application with the Hong Kong government to increase the capacity of two residential projects by a combined 56 per cent, as the government struggles to increase land supply.In its application to the Town Planning Board on Friday, SHKP said it plans to increase the number of flats in Yuen Long fourfold to 1,995 units, from 455 large flats, and reduce the average unit size to 484 square feet, from 2,000 sq ft previously.Hong Kong’s largest developer by…