To minimize time the property is vacant, have the Realtor coordinate with the existing Tenant for the last 30 days of their occupancy for showings so you have the best possible chance of securing a new Tenant without a break in between.I would love to know some of the details of your property, and do a rental rate check up to confirm you have the right price. 

You cannot document something that does not exist.

Purchase price: $15,000 Cash invested: $25,000 Sub to deal - paid the seller and wholesaler $15,000 + $7500 closing costs to assume $84,000 mortgage with a monthly PITI of $575.

Mortgage rates and PMLs are 8-12% plus points right now so the deal has to be a low enough entry. 

If you aren’t saving the money up to buy another property chances are nothing will pay a higher rate than paying it towards your mortgage.

Both these properties have mortgages and they both are required to have insurance on them.

Most mortgage companies will not call loan due if payments are current but you do run that risk and need to be prepared to payoff or refi at a moments notice.

I can assist with the real estate side of things - and probably the mortgage side too.

My mortgage is $2450 monthly.

@Daniel Tanasa $1905 per month (mortgage +interest) , taxes (around 3600 per year) and insurance (1500 per year) => so 2330$ is my PITI