The agents will see the sign too, but not as many as will harvest the FSBO online ads - after all, they have to get up and out to see a sign, but they can find the online ads while sitting on their butt so it's less effort to harvest online.

I would suggest looking online to see what's in your area for rent currently though so you can get an idea for the price point and quality of upgrades people expect.

We use the following rule of thumb - if it does not do permanent damage to the property, if it does not cause neighbors to complain and if it's not a legal issue - it's probably okay.

A lot of the articles i read online made it seem as simple as, if you have leftover, use it! 

There are codes that need to be followed to make it a legal duplex.

Hello BP,I am in the process of purchasing a 2 unit townhome (legally zoned R7) in Baltimore  City MD 21213.

Is there any legal rights a tenant has to remove a non-paying tenant who is also on the lease?

If I fire them, I will also be going after them legally- like a mad dog -  and am looking for equally aggressive legal help.

thanks @Deanna McCormick I have a good idea about the rent rates, I was mostly concerned with any legal issues with raising rent to market.

Plus most agents are completely unorganized, don't return calls/emails etc. and finding a reliable one in some remote corner of the US isn't worth it to me.The only time I make an exception to this is when I'm researching the property online (zillow, trulia, redfin etc) and while looking at other properties in the neighborhood I see an agent that sold something similar fairly recently.