Secondly, how do I deposit the Security deposit into my account from Venmo in order to keep it separate from my other funds?

Your enforcement remedies under law are: 1) deliver a notice to pay per F.S. 83.56(3), 2) make a claim on the security deposit when they vacate per F.S. 83.49, and 3) seek collection of unpaid rent through lawsuit or collection company. 

Pros:- Guaranteed rent direct deposited to your checking account each month by the U.S. government (and they are never late)- HUD publishes the fair market rent increases every year so you can ask the section 8 office for an increase in rent and as long as it is within reason, it is normally granted. - It is hard to find landlords that accept vouchers (in my city the waitlist alone is 200+ families) so people are more likely going to want to avoid getting evicted once they find a home.

She is insistent on using her security deposit as last months rent.

Thanks for your response.If current owner has no security deposits in escrow am I allowed to require deposits or renters insurance upon closing the sale?

I'd also talk to the current owner, so if they want, they can let the tenants in that unit know.Hopefully you are getting their deposits transferred to you (it is the tenants' money and you will have to pay it back in full when they go because you don't know the condition of the unit when they moved in). 

I had to rush to find a new place, shell out thousands in deposits and ended up paying 15 days rent on the new place when I was still renting the old place. 

I would also suggest adding to the lease addendum an increase in the security deposit by the amount of the rent increase.

No public marketing of property you don't own, no lying to sellers, no cash out of your pocket for EMD (earnest money deposit), etc.

The 3% mortgages have MORE servicing value for the opposite reason, these ones aren't likely to be refinanced any time soon, and the market thinks they are less likely to be paid off via home sale to boot.This isn't about your or my crystal ball predictions for inflation and interest rates, this is about billions of dollars of real life bets being placed on Wall Street and by big banks.There's another reason big banks are valuing these low rate mortgage pools: Thanks to some deregulation that happened, they get to use the escrow accounts as "deposits" for the purpose of fractional reserve banking.