Core Central Region :
Core Central Region comprises Postal Districts 9, 10, 11, Downtown Core Planning Area and Sentosa.
Rest of Central Region :
Rest of Central Region comprises the area within Central Region that is outside postal districts 9, 10, 11, Downtown Core Planning Area and Sentosa.
Outside Central Region :
Outside Central Region (OCR) refers to the planning areas which are outside the Central Region.

Reference: data.gov.sg 
(Data.gov.sg was first launched in 2011 as the government’s one-stop portal to its publicly-available datasets from 70 public agencies. To date, more than 100 apps have been created using the government’s open data. This website is an initiative by the Ministry of Finance and is managed by the Government Technology Agency of Singapore.)

With recent surge in property price index in OCR and RCR region surpassing its previous peak respectively, the price in CCR remain an opportunity to home buyers. Covid-19 situation have not only present a window of opportunity and developers are cautious about increasing price of their existing inventory stock. For eg, New Futura was sold out in matter of months on average $3,500 PSF in 2018. Our current sentiment in CCR is yet to achieve such feat due to restriction of travel post Covid-19.