Taking financial loan from islamic organization

Salam, I currently live & work in USA. I am planning to buy an apartment & wanted to take loan from an Islamic organization which claims they use profit instead of fixed interest rate to give financial loans for housing purpose. Eg: They are charging (200k profit + Principal Amount) for a 180k loan which is spanned over 30 years. Total amount is paid in installments over a period of 30 years. I wanted to know if this is halal way of taking a finance ?