CDC 504 loans are for 10 or 20 years. Because the CDC is in second lien position, the bank or other lender doing the 50% first lien loan are willing to lend at a longer term. Longer terms make your monthly payments lower.
For the banker wishing to participate as the 50% lender, you get CRA credits; you lend at a lower loan to value ratio; you keep a growing customer happy; you have lower risk because the SBA 504 loan is in second position behind you. The community gets the advantage of keeping or attracting a healthy, growing small business that will be creating jobs and doing other wonderful things in the community.