Condo's Land Size & Buildup for older properties?

Dear gurus,

I wonder if you could kindly enlighten me, how do I go about checking any Condo's landsize and the buildup?

For newer ones, I suppose I can find the info in the brochures / property launches...

For older ones (e.g. > 10yrs), is there any website that I can look up?

Thanks for the kind advice.

regards,
fc