long term construction loan

[Zaid Badabwan]

Hello

I bought a duplex with a loan from the bank. The zoning allows 2 more units in the same land and I would like to do that. I need your help and expertise in:

1. My options for 20 to 30 years loan to construct 2 units.

2. Do I have to arrange with the lender of the first loan before I start searching for the new loan?

your input will be highly appreciated