Firstly, may I understand what are your property objectives? Are you looking to purchase a condo and rent out the HDB?
If you are SC household, you can purchase condo and keep both HDB & Condo. To answer your questions,
1) Banks usually use the age of 65 as the cut off, hence your max bank loan should be around 28 years. How much they can loan you depends on your age, credit, income profile and any other debt obligations at the moment.
2) Your monthly mortgage repayments can be repaid via a combination of CPF+Cash.
If you are SC household purchasing your 2nd property, ABSD of 7% applies as well, and the CPF you can use will also be restricted by minimum sum requirements. As you have no outstanding loan, you can loan up to 80% for your next property.
Thanks and may we discuss further over email/phone so as to understand your housing plans better? That way I can make value-added suggestions in a much easier way. Thanks and hope to assist further.
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Contact: (+65) 97432395
CEA Registration Number: R052114D
ERA Realty Network: L3002382K