These are NonQM loans that underwrite by using the gross cashflow (as evidenced by net deposits in your bank account or how much was reported on your 1099) and then applying an expense ratio (usually 30-70%) to determine your gross income.

Consider getting a statement signed by all parties which states that everyone has agreed to terminate the current lease early on X date and all obligations by all parties have been paid in full and that the deposit will be kept by the landlord and will be applied to the new lease. 

I would keep the deposit unless I am able to rebook the dates and then I would only make her pay the difference for any unbooked nights. 

They are even working on getting me the evicted tenant's security deposit, the missing JANUARY rent since the place is still empty, and covering the cost of my own manager re-listing the property.

Ensure the buyer provides a non-refundable earnest deposit.3.

Also, most banks will not allow you to "borrow" your down payment, so what you would need to do is get the 50K personal loan and then have it show on your bank statements for two months (without showing the money being deposited, so in reality this could be 3 statements before you have that. 

That’s like depositing $300 into a savings account every month.Plus, it’s an investment property, so you can depreciate it to save on taxes.More Than $1,500This isn’t just about making $1,500 in rent—it’s about building long-term wealth.

Do you currently have enough funds to pay first month’s rent and a security deposit?

You identify the problem (lack of deposit) during your inspection phase, then hit them with an objection that requires them to pay you a deposit at closing.

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.