Hi Mike, First off welcome and house hacking continues to be a great way to get started in REI.

Since that time several other condos have sold.

When sold the percentage of profit allocated to the primary residence should be able to come to him tax free (the first $250K of profit if single or $500K if married. 

so if this is your very first deal - i would pass. 

Title documents and review - Engage with competent attorney and get started on title document review which has a time limit.

Renovation time 3 months.

I have a small 3bd 2 bath rental in 80003 and I've been able to increase rent every time someone moves out.

You could get another loan on a Duplex I have seen it multiple times. 

If they say "it's to cover marketing" then I would argue they probably aren't professional and just charge it because they can.The leasing fee is charged per door, meaning you will pay it every time they place a tenant in one of your rentals.

Thanks in advance for your time and wisdom!