Unit mix should be market driven and keep in mind there may be benefits to having a % of the building affordable and accessible. 

She doesn't.By rejecting her application, you are protecting yourself but you're also protecting her from getting into a financial situation she can't afford.

My area is very expensive and I am currently looking out of state for more affordable, and more landlord friendly, states.

I snagged a copy of their book because my wife and I will soon be FTHB; consequently, after learning about why it's important to have exit strategies and knowing that this 1st home won't be our forever home we started entertaining ideas like a live-in flip, house hacking, or a future buy & hold rental property. 

Some were only temporarily made to work from home and some are now permanent remote, which drove many to flee expensive markets, cashing out of their high-priced homes, and into more affordable markets flush with their equity cash.The effect of that population shift has been that would-be buyers in the more affordable markets have been squeezed out of any reasonable opportunity to buy. 

You unload this property and avoid the inevitable added losses, or you can keep the property, thinking you have $1500 in it already and can't afford to walk away from it...and just add to it. 

---changes and are no longer dependable or affordable. 

Not show up, bill excess because they think you can afford it and they have a new girl friend or whatever...

If it was your dream home and you only sold really because of fear from a money/being able to afford it standpoint I would have turned an aspect of it into an airbnb and used that income to pay down the principle to lower your payment. 

Pricing is more affordable and you still have close proximity to the city.