I assume the deferred gains would transfer to the new ownership structure.

I think you are asking for a quick and easy route to transfer half the interest to ur partner.

The bills are transferred in their name but we are listed as the landlords so that we will be notified if they don’t pay so that the lights, water or heat will not be shut off.

Also, would I need to transfer the property into the LLC or keep the title/mortgage in my personal name and just run the payments and rent collection through the new business account and LLC?

ACH bank transfers are free but a bit slow (at 5-6 days).

I haven’t found any probate or documents after the transfer from the grandfather to the son.

They're probably referring to the Due on Sale/Transfer clause that's found in most mortgages. 

That said, I'm looking for somewhere to transfer my accounts, my business to a bank that loves real estate investors.

I worked for a Subaru dealer in Texas and transferred up to a dealer in Colorado.

Then to transfer and convert currency, depending on the bank it could be either expensive or really expensive... use some third party exchange company like transferwise.If it is only to receive money in the foreign country, transferwise also offers a way to receive local payment with a virtual local account number.