Even if she is at market levels, nothing would prevent requesting a modest rent increase, say 5%, that put you above market levels.

@Michael KingI could have $1500 in a checking account that yes, prevents me from being charged $12 a month as a service feeORI could have $1500 in a online savings account with Discover or Amex that gives me a 1-2% interest rate on my money, even if its just a few bucks.I agree $1500 is not a lot of money, however it is just sitting in a checking account not doing anything (ie, not invested making me a few bucks), it's just a placeholder for the account to hold the fee.

(it prevents the issue if one part of the contract is ruled not enforced, then the rest of the contract will not be nullable) - what is that called? 

This also prevents any type of co-mingling. 

Fighting over the Security Deposit is one of the main issues between Landlords and Tenants. What steps do you take as a Landlord or Property Manager to ensure the deductions from a Security Deposit are not disputed? I...

You can't afford the cost to build a guest house and then be prevented from renting it out.

You don't want to find out you cannot sell because of some state law that prevents you from doing so. 

Basically prevents you from discriminating against certain classes of individuals. i.e. race, religion, familial status, etc.Know Your Lease:  I would recommend you buy a state specific lease, they're online for $20-30. 

I don’t want to be stuck in a difficult situation later if I could prevent it.I really would like to invest locally but living in bay area California does not help.

That is, it doesn’t prevent future bacterial or fungal growth.