Here is the list of few Economic Research Institutes located in Delhi which you are looking for .
Socio Economic Research Institute (SERI Trust)
90- 91 DDA Flats,, Dwarka sector-9, New delhi, Delhi 110075 ‎
011 2508 3914 ‎

National Council of Applied Economic Research
Parisila Bhawan, 11, Indraprashta Estate, New Delhi, Delhi, 110002 ‎
011 2337 9861 ‎•

Institute Of Economic & Market Research
No. 16, Dakshneshwar, 10 Hailey Road, New Delhi, Delhi 110001 ‎
011 2332 9216 ‎

National Institute of Public Finance and Policy (NIPFP)
18/2, Satsang Vihar Marg, Qutab Institutional Area, New Delhi, DL 110067 ‎
011 2656 9303 ‎

Institute for Human Development
NIDM Building, 3rd Floor, IIPA Campus, IP Estate, Mahatma Gandhi Marg, New Delhi, Delhi 110002 ‎
096 50 288015 ‎