Name the gap early and precisely
Total development cost minus credit equity minus supportable hard debt is the gap. Write that number down at the concept stage, before the architect has drawn anything you would be sorry to lose. On a typical 9% deal in a high cost market it runs twenty to thirty five percent of total cost, and on a deep targeting or supportive housing deal it runs higher.
The mistake is treating the gap as a residual that will be solved later. Soft sources have application windows, scoring criteria, environmental and procurement requirements and their own underwriting, and most of them cannot be assembled in the sixty days between allocation and closing.
The usual sources and what each one asks of you
HOME and CDBG funds from the state or the participating jurisdiction, which bring federal cross cutting requirements including environmental review under Part 58 and, often, Davis Bacon. State housing trust funds, which vary enormously and are the most worth knowing in detail in your own state. FHLB Affordable Housing Program subsidy, which runs on an annual competitive round through a member institution and requires a retention agreement. County and municipal sources, including TIF where the jurisdiction will use it for housing. Deferred developer fee, which is not really a source but is counted as one, and which the investor will test for repayment from cash flow. Seller notes and land write downs, which are the cheapest money in the stack when a public entity or a mission seller controls the site.
Each one carries conditions that can conflict. Two federal sources can impose two different environmental processes. A local source may require a payment in lieu of taxes agreement that the investor's underwriting has not assumed. Read the conflicts before you stack them.
Sequencing beats shopping
The question is not which sources exist. It is which calendars you can actually hit. Lay the award dates for every candidate source on one page against your credit allocation date and your placed in service deadline. Sources whose next round lands after your closing target are not sources, they are next year's plan.
This is also the argument for applying to the gap sources before or alongside the credit application rather than after. A conditional commitment from a trust fund strengthens a competitive 9% application in most QAPs, and it means you are not negotiating your whole gap in the window where you have the least leverage.
What to do when the gap will not close
Reduce scope, change targeting, re examine the site, or wait for a better round. Those are the honest options. The dishonest option is to carry an optimistic soft source in the pro forma and hope, and that is how a sponsor ends up with an allocation it has to return.
We would rather tell a client in month two that a deal needs a different site than watch it unravel in month fourteen.
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