RBC and HSBC both have retail branches in Seattle. I'm not as familiar with Deutsche Bank USA, they have a branch in Seattle but it appears to be for corporate customers.
My company does property management so if you are interested in purchasing an investment property and leasing it out, I can also help you with that.
It sounds as though your main interest is in investment in US, which is certainly doable at any level. In the core of the city we're seeing 5-10% appreciation this year but just as on the east side, those are not inexpensive neighborhoods. It might be just as reasonable to save up the cash for a few years. A higher investment in equity will always give you an advantage in the market. There is a huge amount of cash that is currently competing for the lower and middle markets right now and by that I mean purchases without any financing.
Drop Richard an email. Please let him know that I sent you over.
Some local lenders (where do you want to buy?) portfolio their own loans and have some flexibility in making them.
Another option is pooling funds with a few friends if you can convince them that it is a good idea.
If you are interested in the Seattle area I can work on it with you.
Where do you want to buy? If you are living abroad and continuing to, you should seek lending options in the country you are in. US Banks primarily finance US properties, as conventional mortgages. If you are living in a country where you are residents or citizens, and plan to live there for a while talk to the local banks about the options.
If you are hoping to buy it the state as investment property, you will have a more difficulty as there is little for the US bank to pursue if you were to default, except the property, thus a large down payment is their security.
If this isn't what you were looking for, give us some more information and we can try to help further.