My partner was not on any official record.

If I were in your position I would ask for an official loan estimate from both the broker and service company. 

The lease termination fee needs to be paid at the time they request this, do not substitute the security deposit for this purpose.This will ensure compensation for time, money and effort needed for a tenant turnover, including advertising and showing costs, regular repairs, utilities during vacancy etc.

Security Deposits / Escrow: If you would like to use Baselane for an escrow account, you can simply open another sub account that is separate from your day-to-day activities.

For example, each of my properties has a main account and the sub-accounts under that for CapEx and security deposits.

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

This is a general question for security deposit deductions made by a landlord of a complex.

Borrowing from multiple investors on one note creates a security that likely requires a registration or some other form of exemption.

Let's say I buy at tax sale, I want your rehab money 30 days later, would you lend to me for the rehab without security of the property?

Give them 24 hours to pay the security deposit and sign the lease.