Thank you.Plan check is a methodical record building exercise, that involves many different civil servant operatives, with specific agendas and CTA (cover their a$$) criteria.

Tony Robbins awaken the giant within book, has a section where you go through a written exercise to plan this out.

It might just mean your buyer exercises the contingency and exits the deal. 

Also if i am able to do that, what if eventually the tenant wants to exercise their option to buy, will they pay me in full and then i pay the person i leased from??

Here is a blog where I wrote about a recent 42 unit we bought and did creative things to add value. https://www.biggerpockets.com/renewsblog/bought-multi-million-dollar-apartment-complex-age-26/Just a few ways to produce ancillary income:- Laundry Coin laundryDetergent/laundry essentials in a vending machine in the common area laundry rooms.Rent individual W/D to each unit-Parking Garage parkingCovered parkingprime spot parkingJust plain old charge for parking-Renovations Interior units upgradesCommon area renovationExterior upgrades for curb appeal-Vending machines In common areas such as exercise room, pool house, laundry or leasing office-Trash pick up service In high-end buildings they have a service where you can set trash outside your door and for a fee maintenance will go around each night and collect it so the resident doesn't have to carry it to the dumpster.

Now there is something called due on sale clause and this can be exercised if title is changed out of your name. 

@Hugh TrotmanYou might try this exercise - but I warn you, it's exhausting.Your goal is to be resourceful and stretch, not yourself, but your network.What can you get your network to do for you?

But finding GOOD lease option buyers to assign to is a much more difficult task, because the reality is that 70% of people who call me on my ads are not a good fit, and likely wouldn't be able to actually exercise their "first right of purchase" on the home after I assign to them before the expiration date.

He keeps the signed deed in a vault in his office until the option is exercised, then he records it with the clerk.

At minimum the tenant needs to be instructed that they must exercise better hygiene, and I would put this in writing in case you have to sue in small claims for damages.