Rental yield means how much returns you will be getting if you rent out your unit at Parc Esta. You might compare it for example to a term deposit where you might get say 1% p.a. interest. If you can achieve a rental yield of say for example 3.5% it is three and a half times more. That does not include your potential capital appreciation yet. Note: rental income is taxable, for details please refer to IRAS.