This is completely different from creating two LLCs, and there are many reasons you might want to avoid the complexities of having dual LLCs, particularly for a smaller asset, like the one described in this thread.  

Hey Jake,If you're looking for an apartment complex most of those are going to be around Downtown area inside the 610 loop.

By embracing change, leveraging technology, and focusing on sustainability, individuals and businesses can not only navigate but also master the market's complexities.

Can I refer clients to apartment complexes or landlords myself or do I need to refer them to an Agent who is licensed in that state?

AS @Kevin Sobilo pointed out this is very STATE specific.some states is quite clear cut others it utterly complex.

. , especially for complex website with a lot of user interaction .  

I started charging refundable fees for viewings (which wouldn't work for an apartment complex, but if a stranger wants to walk through my house, they need to have some skin in the game!)

He does my personal taxes and everything for my 10 apartment complexes, partnership returns etc.  

You can't just throw up new complexes left and right like you can in Kansas where it's flat and you simply build outwards. 

We bought a house and 7 unit apartment complex.