0 down implies a highly motivates seller.
Why is he/she (usually a he actually) very motivated:
a) he is very old or sick
b) the property is in bad shape and needs $50,000 for a new roof that the seller doesn't have
c) the property is in a bad part of town with high vacancies (and needs work too)
d) the property has a mortgage that exceeds the property value
Hence: Buy in US warzones .. or in the odd case in a Canadian one from a distressed seller with a garbage property in a bad area. But then you must have loads of cash to fix it up.
Sorry to destroy your hope. It cannot be done in a healthy city with upside.
The best way to buy an older one with 20-30% cash down and fix it up, raise rents .. then re-finance with an 80% mortgage one or 1.5 years later. Then you may get your initial money back.
Or you do JVs with other people's money .. and that usually works only if you have proven yourself over 3 or more projects (I call this a "track record")