Upgrading from 4 room flat to executive condominium.

Reader:
Hi AK, I have been scouring your blog and other cpf articles but need your advice.

I currently have about 67k in my cpf OA (I refunded my OA with cash for my hdb installments which I previously paid using OA, thus considered cash payment for my hdb) And 63k in my SA (due to yearly top up).

I am turning 30 this year. I started using cash to continue paying for my hdb installments