The General Authority for Statistics (GASTAT) provides the Real Estate Price Index data through the Ministry of Justice to construct the real estate price index and to track changes taking place in the real estate prices. Given the paramount significance of such data, an integrated system was developed to fulfill all requirements necessary for collecting and auditing data, along with calculating the index. The Ministry of Justice data are classified into three main sectors: Residential Sector which includes residential plots, residential buildings, villas, apartments and houses; Commercial Sector which covers commercial plots, commercial buildings, galleries/shops, and malls, and Agricultural Sector which is made up of the agrarian lands. In a statement to Saudi Press Agency (SPA), the GASTAT issued that the Real Estate Price Index for Q4 of 2017, compared to Q4 of 2016, declined by 3.2% due to changes that took place in the constituting sectors of the index as follows: residential sector %2.2 ; commercial sector %5.7 and agricultural sector %0.6 . The index for Q4 of 2017, compared to Q3 of 2017, declined by(0.3% due to changes that took place in the constituting sectors of the index as follows: residential sector %0.2; commercial sector %0.7 and agricultural sector %0.1 .