Montgomery Industries spent $$600,000$ in $2023$ on a construction project to build a library. Montgomery also capitalized $$30,000$ of interest on the project in $2023.$ Montgomery financed $100\%$ of the construction with a $10\%$ construction loan. The project was completed on September $30,2024.$ Additional expenditures in $2024$ were as follows:

February $28$ $ $90,000$

April $30180,000$

July $136,000$

September $3064,000$

Required:

Determine the completed cost of the library.