And from reading other forums, the people here seem really helpful.

If anyone knows some books to read to learn more about syndicating deals I would appreciate the info.  

I want to purchase in America, I read that it's legal for Non-US residents to do it.

It is good to get feedback vs a brush off.

Great book to read for land lording is The book on Biggerpockets on Managing Rental Properties.

I am reading/studying the beginners guide and I look forward to purchasing some more material from the site.

Financing with 20-30% down isn't bad but I couldn't repeat that without earning cash at this point so I'd rather find a way to flip these or find a way to get them financed more than 80%.Option 1) lease optionsI've read a bit about these but not with tenants already in place.

A lot of landlords and experienced investors attend and you can present the numbers in your deal (keeping the address private) to get feedback.

I read a lot of books and threads regarding the importance of Due Dilligence for the apartment buildings.After the proptery is under contact,I will definitely do the detail due dilligence in person and with propterty manager or contractor.But still I have the concern that before I put the proptery under contract,if I am in long distance or out of state,how could I do the due dilligence to do the pre-acqucition analysis (repostition chance,how much value can de added)?

Spending some time here and doing some reading will get you there doing some deals in know time.