Yes. You are able to book your unit first before your choice is sold.1) Keeping your HDB – Please do note that keeping your HDB while buying a second property will be subjected to​ Additional Buyer’s Stamp Duty (ABSD).2) Planning to sell your HDB – You may book your unit if you are planning to dispose your HDB within a proposed timeline and condition. Please seek help and assistance from Our Developer Sales Team to be advice further with other options, strategies and more queries. We will guide you along and arrange a more beneficial way to meet your current condition. Any additional conditions are case by case basis. Please call our Sales Hotline or arrange a private appointment with our staff.