Prime Property Developers The Keystone is an apartment cluster coming up in Kowdiar, Trivandrum. It has numerous units on offer through the developer. They are spacious, bathed in natural light and aerated. Different amenities have been provided for the benefit of home owners such as health club, generator, waste disposal system, landscaped gardens, multipurpose room and swimming pool. Prime Property Developers is a well-known builder of the city. They have a range of projects to their name. Kowdiar is an east Trivandrum suburb. It is surrounded by areas such as Anayara, Peroorkada, Pallithura, Kumarapuram and Karamana. The area’s social infrastructure is well-developed which is why home owners prefer living here.  View less