you also have to factor in competition. cause you're not the only one buying for investment. some can do long term rental some go for short term stay. what type of tenant you looking for. what makes your unit more attractive than other projects in the vicinity which probably has lower entry price assuming you buying undercon, or even other units from the same project. what is the range of rental in the area. a lot of developer sales agent said its very close to amenities etc etc but how close is close? some driving distance also can say is close. you need to answer yourself these questions lor.  good investment for everyone is different. chocolate is desserts for people but poison for dog.

being freehold doesnt really promise anything also. being highrise, chances of it lasting more than 90 years. hmmmmm. it only enable developer to charge you more. thus higher entry price.
if gomen wanna take over your land pun freehold leasehold is the same.

"The location is strategic, near to offices building, shopping malls " but in the grand scheme of things is it close to city center or other high population area? it also didnt guarantee your return if mall and office is half empty.