If you are opening the LoC shortly before - or in tandem with - your mortgage it may not register on your credit history before the mortgage is awarded ... though these days such things are automated and near real-time, so there will probably be very little lag.Regardless, when you read the fine print of your financing application and/or the mortgage documents themselves there will undoubtedly be included a declaration where you attest the downpayment does not comprise borrowed funds.  

After you have all the signatures on the lease, tell them you forgot the application.

I keep applications on hand for this purpose; or, you can start fresh, by not renewing the lease and get new tenants in who are okay with paying their own utilities.

The tenant still needs to give a 30 day notice to move and I still do a regular application.  

I would put future showings on hold and run with applicants you have.

You should obtain the advice of counsel in your applicable jurisdiction as what I have opined above may not apply to your state.*

You really have to apply state codes and understate major applicable case law and apply to a very specific set if facts and circumstances to get a good fix on a situation. 

The 'application' for training wants a lot of your personal information not needed for a course and a whole LOT of your financial information down to current balances and limits on bank accounts and credit cards, mortgages, HOLOC and other credit lines, friends/relatives you can borrow from... in other words any way than you can be driven to tap and max multiple sources to pay them right there.5.

Always confer with a lawyer, particularly one who specializes in this type of knowledge as I have come across ones who are just as ignorant about these laws and regulations. 105 CMR 410.000 MINIMUM STANDARDS OF FITNESS FOR HUMAN HABITATION940 CMR 3.00 3.17: Landlord-Tenant254 CMR 7.00 Apartment RentalsMassachusetts General Law Chapter 186Finder's Fee (Broker's fee): To most, this is that pesky fee that real estate agents and brokers charge and receive for seemingly doing nothing but showing a rental unit they probably haven't seen either, getting the prospective tenant to submit an application, sign a lease and voila, they take a check usually equivalent to one months rent.

Start from the ad, the first contacts, showings, applications, screenings, etc.