Here are notable eco-friendly / sustainability-focused residential projects and developments in Kolkata, with a short summary of the green features for each and sources you can consult:

1. Uniworld City (East Kolkata)

• Highlights: high percentage of open/green space (reported ~60%), on-site sewage treatment plant with recycled water used for landscaping/flushing, waste segregation systems, heat-reducing paver blocks for driveways. (greenkolkata.iamKolkata.co.in)

2. Lake District (East Kolkata)

• Highlights: large green cover (~40% reported), retention of mature trees and biodiversity, ongoing composting and waste-management initiatives, exploring wastewater recycling and rooftop solar. (greenkolkata.iamKolkata.co.in)

3. Rosedale Gardens (mentioned among eco-conscious high-rises)

• Highlights: green open spaces, community-level green practices (composting, pet‑friendly greens), part of the group of high-rise complexes adopting greener operations. (greenkolkata.iamKolkata.co.in)

4. Calcutta Riverside (tidal/riverfront township near Hooghly)

• Highlights: masterplanned mixed-use township claiming environmentally sensitive design—retention/rehabilitation of water bodies, recycled water usage for irrigation and HVAC, green-building registration for some precincts, emphasis on green cover and low-sewage discharge. (Large-scale township rather than a single tower.) (en.Wikipedia.org)

5. Selected newer mid-rise and villa projects promoting sustainable features

• Examples include developments marketed by smaller “green homes” builders (rooftop solar, rainwater harvesting, low‑VOC materials, STPs for reuse). These vary project-by-project—check RERA/ project pages for specifics. (GreenHomes.properties)

Notes and how to verify

• “Green” features reported in local coverage and developer materials include: STPs (sewage treatment plants) with treated-water reuse, dedicated green/open space percentages, waste segregation/composting, paver blocks to reduce surface heat, rooftop solar, rainwater harvesting, and use of sustainable façade/building materials. For any project you are considering, confirm these features on (a) the developer’s official project page and brochure, (b) the project’s RERA listing (Kolkata/WB RERA) for approvals and specifications, and (c) independent news or residents’ association reports. (greenkolkata.iamKolkata.co.in)

If you’d like I can:

• Compile a shortlist of currently active/sale eco-friendly residential projects in a specific Kolkata sub‑area (e.g., New Town, East Kolkata, Howrah, South Kolkata) with direct links, or
• Pull RERA registration and the developer’s sustainability claims for 3 specific projects you name.