I was told by the manager that HOA cannot do anything about it, but I know for sure that the air duct can be insolated and properly secured to minimize the noise and avoid wall vibrations.

You should’ve given them the proper notice that you were entering and then followed through.

Assuming around 50% expenses and $840k PP you're at a 4.5 cap.I don't know your market at all but that doesn't sound like a great deal.It sounds like a brand new A class building so expenses should be lower though.You would need to get all of the actual numbers to really analyze it properly.

If so, you will need to honor the terms of the existing lease.If there is not a valid lease in place, and they are there month to month, you can simply provide them with a notice of non-renewal (make sure to follow the proper length of lead time required by your state). 

I'm a 33 yr old married Austinite Healthcare Software Developer by day, and an enthusiastic RE Investor by night.

As you have planned, as you start accumulating more and more equity, it would be a good idea to get an LLC and properly manage the LLC to get the desired protection.

As of now, we plan on having a robust written agreement and I'm looking for advice on the proper structure (LP, GP) and how it plays into the mortgage, liabilities, holding title, etc.Thank you in advance for your help!

I currently have six rentals, one commercial, one new construction spec and seven parcels of developed land that I will continue to build on.

Paying a qualified attorney to get this setup properly would likely wipe out all of your profit from your first rental.

It can be your first stop and last stop of the day.RECORD KEEPING: Always make sure you keep minutes of the incorporation meeting (decide on business entity and set up by-laws), shareholders meetings at least annually and give proper notices.