I've looked in my area and have found the same, I'm not aware of any big/formal lending institution in my area that will give a 30 yr am fixed rate loan to an LLC. The best I've found under that scenario is 10 yr fixed Term and 25 yr Am, with rates varying 5.5-6.5%
afaik the 30 yr fixed is only for residential loans to an individual and it's so the loans can be packaged for securitization. Buyers do it that way and then transfer title to an LLC, they just hope the lender never notices.
I suppose there's the BOM/private lending path, or seller financing. Otherwise why not take the commercial loan and just get it paid off sooner?
There are 30 year fixed products for investment properties under LLC's but the rates will be a bit higher. looking at around the 8%'s or at best mid 7%s
Hold the property in your own name if you want a 30 year fixed at a good rate.