Finding Money For Large Multi-Family Deals

OK, so I can go to a bank and get a loan for a $350K 12-plex by putting 20% down but what if you want to purchase a 100 unit apartment building?

If you have great credit and about 100K but don't have a half million net worth it seems it is not that easy to get money.

What are some creative ways to get into a LARGE deal when you are missing the 20% down (maybe only have 10%) and your net worth is not through the roof?

I know you can find another investor but even then how do you go about vetting them and not getting "screwed" in the deal?

Does anyone have any experience in large multifamily deals that was missing either the 20% down payment, net worth or both?

Can you share your knowledge on the subject please?

Thanks!