what will be a good place to find such a partner?

I'm still learning a lot about this and our initial thoughts were to find a place with tenants.

One way to better your odds is to find a partner and do this together.  

In terms of getting into apartment complexes and large transactions - it's much easier than you think.Real estate is filled with opportunities to deploy capital, but in the same time is filled with fast-talking snake oil men that will happily take your money towards a "fund" so you own a portion of a large portfolio... only to find out the fund's performance is below par, your money is locked out, and the only person making money is the fund manager from the management fee they've locked you into. 

The problem I am having is that I am finding it very difficult to come up with a downpayment of 20% to purchase new properties.

It's a free resource that helps you quickly find top investor-friendly agents in your area who specialize in real estate investing.

How did you find this deal and how did you negotiate it?

@Craig JonesMight find a hard money lender for a short term but it’s gonna be really expensive

Did you find a software?

How can I find the balance between deducting expenses and remain lendable?