About We also specialize in developing new building on land. This involves coordinating with landowners, land acquisition, sketching building plans, signing joint construction agreements, applying for building lines, discussing plans with architects, applying for building permits, selecting contractors, entrusting building management, designing the exterior of the building, applying for use permits, and completing interior renovation designs. Regarding overall construction costs, we suggest aiming for a range of 100% to 150% of the land value, which is considered a reasonable guideline.