Advice needed

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Hello everyone. 

I am 27 currently a student. I want to own an apartment complex in the near future.   I am really determined and I am already working towards it.  

I have been making a lot of research in buying or building an apartment but apparently I will be more interested in buying an apartment complex . My questions are :

What is the minimum credit score I need to have to be able to get a loan 

What is the minimum down payment I need to have if I intend to buy an apartment of les than a million dollar 

any other information will be helpful as factors that affect buying/owing an apartment. I have started saving and I intend to start this project in 2-3 years. Please help as I will be asking more questions.