If you had applied for the Built-To-Order (BTO) flat under the Public Scheme or Fiancé/Fiancee Scheme and then renounce your Permanent Residency, your application may be considered null and void. You and your wife may have to return the flat to HDB.
Hope this answers your question.
It is better you put your inquiry to HDB direct. There are quite a lot of implications. Submit your request via the link below:
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