Each property is legally zoned for a specific number of units and it will be determined by getting a zoning certificate from the city.  

You can also check if there is a Certificate of Occupancy and other fun stuff.

Require your contractor to contact the insurance agent or insurance company and have the insurer issues a certificate of insurance directly to you with you being named as the certificate holder.

You'll need to know the procedures for whatever the system is there....tax lien, certificate, deed, redemptions, foreclosure proceedings, etc.

trivia question. what would be the starting point (that would count towards the 90 days) of your ownership of a property purchased on judicial sale in IL:1) date of the certificate of sale  received at the auction2) date of confirmation of sale by the judge - usually 3/4 weeks later depending on (un)contested docket.3) actual date of the deed - which you can or cannot record (depending on local municipality requirements - presale inspection etc)4) date of recording of the deed

or is there any kind of international broker certification?

My goals are to get my certifications, learn property management and then start investing in real estate.

What doctor signed the death certificate?

@Michael Noto the current owner has to do all the repairs and get the inspection for certification of occupancy.I am thinking the building is fully repaired and operational. 

In the picture I am snuba diving but I'm planning on getting an open diver certification soon as well.