Kendall,
First, welcome to BP, this is an incredible community with resources for every topic.
Second, I am an investor who is also a commercial banker by day. One thing to remember when talking about traditional banks is that they are all similar but they each have different policies. It is always good to build a relationship with the banker to discuss what loans they do and which ones they don't do. What their policies are and what they have for expectations also varies.
An LLC puts you into commercial banking department in most institutions but not all. Some smaller banks handle these loans differently. If you do transfer deed to an LLC the bank will expect you to also finance on the commercial side. They may or may not catch it if you don't disclose this, but you should be prepared to deal with the consequences of the change if they do find out that you have switched from a personal name to an LLC.
Most banks will only do commercial funding for 20 years max but again there are some smaller banks who may do 30.
The partnership piece is good to consider if you have a money partner. I have done this on a few of my deals. Most banks will expect that money partner to own a 20% share in the "business" in order to consider them as a guarantor on the loan application. Again, there are some banks that are looser on this policy.
Best advice I can give is to shop around for your bank and banker. You want a banker who will look out for your best interests and can provide you with all details and what-if's so that you don't have any hiccups along the way in the financing process.
Hope this helps,
Bryce