Here are the documented resale criteria: unit type must be 2 bed 2 bath or 3 bed 2 bath, purchase price up to $1.6 million, loan amount $1 million, downpayment $600,000, no unprofitable transactions, property age less than 10 years, selling timeline within 4 years, son and daughter are American, and cannot purchase an executive condominium (EC) less than 10 years old.

Here is the documentation of your resale property criteria for Singapore, tailored for your requirements:

- Unit type: 2 bedroom 2 bathroom or 3 bedroom 2 bathroom condominium unit
- Purchase price: Up to 1.6 million dollars
- Loan amount: 1 million dollars
- Downpayment: 600,000 dollars
- Transactions: Only properties with a track record of no unprofitable resale transactions
- Property age: Less than 10 years old at the time of purchase
- Selling timeline: Intention to sell within 4 years
- Family note: Son and daughter are American citizens
- Restrictions: Cannot purchase an executive condominium that is less than 10 years old

If you wish to proceed, you should focus on recent private condominiums, avoiding executive condominiums under the Minimum Occupation Period due to regulatory restrictions. When searching, pay close attention to the resale transaction history of each unit, confirm the tenure and age of the project, and ensure listings fit within your price and financing parameters. Singapore’s property data platforms, such as EdgeProp Singapore, are suitable for tracking these criteria, market listings, and historical transaction records.