After setting aside emergency funds(DBS Multipler/uob one ect) how much investment returns can one expect by passively investing in singapore REITs or Blue chips shares?

Based on the Singapore REIT ETF and STI ETF prospectous on their past perforamnce, one can expect a 7% annualised returns over the long run. The past eprformance are stated in the prospectus of the ETFs which are on the front page, so it is easy to gauge​​​

I assume you are referring to dividend returns when you asked this question.

For reits it will depend on the sector you are vested in. It can range from 4% onwards to about 7% or so.

Blue chip stocks wise, it's typically about 3% or so.

Reits listed here are enjoying a spectacular run so far this year. Not sure if it is an outlier or it will continue its run for some time. If there is an increase in interest rates, you may expect prices to fall.