How do I word in an offer that I can only pay "X" amount only in rent and need 45 days free for remodeling? - commercial leasing offer letter

I have an offer for a commercial piece of property to build my business, but can not pay $ 3000. She asked $ 4800, but only one year lease. I make money only if the rent is low, but if the cost is too high for defining the business iinvestment not paid. What is the best way to get the letter I can pay 3000 to be held free of rent and 45 days to write, because the renovation Wil. Please advice.