About to close on my first duplex. Where do I go from here?

[Jake Smith]

About to close on my first duplex here in California.  I have the preliminary calculations below.  The current lease states the landlord is responsible for water, sewers, and garbage.   The rent is at market rate.  What can you guys suggest to increase cash flow to the property?

Rental Property Calculator

Result

For the 20 Years Invested Return (IRR): 15.76% per year Total Profit when Sold: $508,194.80 Cash on Cash Return: 668.68% Capitalization Rate: 6.53% Total Rental Income: $702,846.61 Total Mortgage Payments: $333,762.50 Total Expenses: $164,736.39 Total Net Operating Income: $538,110.22

First Year Income and Expense Monthly Annual Income: $2,800.00 $33,600.00 Mortgage Pay: $1,390.68 $16,688.12 Vacancy (5%): $140.00 $1,680.00 Property Tax: $375.00 $4,500.00 Total Insurance: $75.58 $907.00 Maintenance Cost: $100.00 $1,200.00 Other Cost: $41.67 $500.00 Cash Flow: $677.07 $8,124.88 Net Operating Income (NOI): $2,067.75 $24,813.00