"Develop an environmentally sustainable master plan for a residential area in Muscat, Oman, consisting of buildings with three floors each. Prioritize energy-efficient and eco-friendly design principles, considering the local climate and culture. Propose innovative solutions for sustainable construction materials, renewable energy integration, and water conservation. Create a harmonious balance between residential, commercial, and recreational spaces within the three-floor structure, fostering a close-knit and sustainable community. Ensure compliance with local regulations and aspire to set a benchmark for future three-story residential developments in Oman."