The motivation for this research is to identify the external and internal factors considered by buyers of residential apartments in National Capital Region of Delhi (NCR). Internal factors refer to the specifications and facilities offered by the builders within a township, whereas external factors refer to easy availability of loan, payment plans, discounts, brand name of builder, etc. This research also helps in analysing the differences in perceptions of buyers about the three important locations for residential apartments in NCR, viz. Gurgaon, Noida and Greater Noida based on parameters such as business opportunities, law and order situation, medical/educational facilities, etc. The research would further analyse the differences in perceptions about three major real estate players operating in the area, namely Unitech, Jaypee Infrastructure and Omaxe group. After conducting interviews with the assistant sales managers of a leading real estate company along with few real estate brokers, two questionnaires were designed to cover the two sets of objectives of the study. The results have been arrived at by using SPSS and Excel. The basic tools used are factor analysis, ANOVA single factor and Tukey-Kramer test.