Corner building with adjacent empty plot in agios spyridonas

Building with a ground-floor shop and three apartments across two floors, plus an adjacent vacant plot. Plot area: 542m2 Density allowance: 100% so 542m @ 100% = 542sq.m . Existing building: 246sq.m so remaining buildable allowance 296sq.m Coverage allowance: 50% so 542m @ 50% = 271sq.m. Existing building 138sq.m so remaining coverable allowance 133sq.m Allowance of 3 floors with maximum height of 13.5m