Hi Li,
Yes. There are restrictions. You cannnot do that.
The recent new regulation does not allow buyers of resale HDB to buy private property in the first 5 years.
In fact, within the first 5 years of owing the HDB, you cannot sell or rent it too.
You could however the following options;
1)renting out your HDB if you have met the Minimum Occupantion Period and rent a 3rm HDB.
2) Sell 5rm, buy private and rent HDB 3rm.
Please note that my sugestions might be subject to your other circumstances that i am not aware of and carries a certain high amount of risk.
You might need professional advice to execute it correctly.
Good luck!
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