A Wayside Inn (Vazhiambalam) of the revenue department occupied the south east corner of that junction at the foot of the diamond hill.
Vellayambalam hosts buildings of a number of governmental and other institutions ranging from KELTRON, Kerala's Electronic hub, Latin Arch Bishop's House, St. Theresa of Lisieux church, Police Headquarters, Trivandrum Planning Board, KFC-Kerala Financial Corporation, KPCC centre, Kerala Water Authority, Ambedkar Hostel for boys, Air India's District Office and the Institute of Engineers Hall.
KELTRON constitutes the major portion of the place with its development center, internet cafe, CUSAT educational programs.
Rajapatha starts from Kowdiar and goes through Vellayambalam, the buildings here are beautifully illuminated with colorful lights in the eve of Onam.
Vellayambalam is adjacent to the neighborhood of Kowdiar where the royal palace of Travancore King Sree Chithira Thirunal Balarama Varma is located.
Manaveeyam Veedhi which hosts numerous cultural events including art exhibitions and street plays is located in Vellayambalam.