Investing money from credit lines with tax deduction on interest

[Mark K.]

Does anyone know if we do this in a business real estate development deal iF the interest on our lines would be deductible? If not does anyone have suggestions for an investment vehicle where they would be? We have an offer at 15 % annual return for 3 years-10 % paid in monthly installments. 5% at term end. Development company guarantees the ROI.