With respect to what you get back, I'll echo other replies here and state that it is dependent on a lot of factors including your marital status, other income, etc. which determine your tax rate. 

I currently have no plans to change the mortgage at all and would like to keep my current payment and rate as is. 

Regulating rent rates creates less inventory and higher prices.

Best regards,Alex Marti

If closer to the latter, the entire business plan can be at risk and it would very likely need immediate adjusting in a way that best protects investor capital.

Buying a duplex-quadplex is going to be your best in terms of cash-flow though.

At any rate honor the lease and give them the 30 day notice.

In San Francisco, this choice is taken out of your hands and is instead a determination made from and by the Planning department.From an Investment POV, you are absolutely correct that combining the lower and the ground floor units is the best option to preserve your ability to perform a fast track condo conversion and generate the most equity in the shortest amount of time.

All information is helpful to the best real estate agents.

What is the best way to increase her rent?