They want me to use their seller alta title policy.

If you really need the money ASAP, there are now alt-a programs that'll use bank statements for 12 months to validate your self employment income.

Where is your HUD-1, 1099's, required disclosures, where is the audit trail of escrow deposits and accounting of you paying off someone's mortgage, ever hear of federal settlement requirements or ALTA, money laundering, tax evasion, ?

The security deposit and pre paid rents should be transferred to the buyer at settlement and should be on the ALTA closing documents.

If you read the provisions of an ALTA commitment you'll find losses are limited to money spent complying with the requirements, which I believe the $50k bid is.In general a title commitment is valid for six months and I believe it is a valid enforceable agreement by the title underwriter to issue a title policy under its terms and conditions during that time.  

@Alexander Felice would probably put the money for upgrades on the ALTA closing docs, pay it into escrow at settlement, then disburse it to the vendors as the work is completed.

Alta Survey? 

Waiting on the as-built surveys for my current properties and a ALTA survey  to get done on the the land. 

That is generally listed in Schedule BII of the exceptions of a Standard ALTA policy.

There are several Alt-A lenders that will allow you to do this.