According to Maharashtra Stamp Duty guidelines, "Extra Quality" features include:

If you are buying a property with an extra quality tag, keep the builder's specification list, OC (Occupancy Certificate), and amenity list as proof. If the registrar challenges the valuation, these documents are your defense.

The code is a specific Village/Division identifier used within the IGR valuation system.

The Maharashtra government is moving toward a linked to market rates. For zone 200102 (Chakala/J.B. Nagar), the arrival of the Metro Line 6 and the proximity to the new Navi Mumbai International Airport will likely push base rates up by 15-20% in the next 3 years.