Closing a Gap in the Capital Stack

A sponsor underwrites a deal, whether an acquisition, a development, or a recapitalization, and finds that the senior lender’s proceeds, sized to loan-to-value or loan-to-cost limits, fall short of total project cost. The remaining gap needs to be filled somehow, and using only the sponsor’s own equity would dilute returns or require more cash than is available.

This gap shows up across almost every deal type: an acquisition where the purchase price exceeds senior leverage, a development where construction costs outpace what a construction lender will fund, or a recapitalization where existing equity does not want to contribute additional capital to cover the difference.

Mezzanine debt, secured by a pledge of the ownership interests rather than a direct lien on the real estate, typically sits between the senior loan and the sponsor’s equity, filling the gap with capital that behaves more like debt: fixed payments and a defined return.

Preferred equity fills a similar position in the capital stack but structured as an equity investment with a preferred return rather than a loan, which can suit deals where the sponsor wants more flexibility than debt terms allow. Co-GP equity is a narrower option when the gap capital should come with an experienced operating partner attached.

A provider evaluating gap capital looks at the entire capital stack, not just its own position: how much senior debt sits ahead of it, what the sponsor’s remaining equity cushion looks like, and whether the overall leverage across the stack still leaves a reasonable margin of safety if the deal underperforms.

The size and terms of the senior loan directly shape what gap capital is willing to do, since mezzanine debt and preferred equity providers are effectively relying on the senior lender’s underwriting as a foundation while adding their own view of the sponsor and the business plan.

The choice between mezzanine debt, preferred equity, and co-GP capital depends on how the sponsor wants the gap capital to behave, fixed obligation versus flexible equity terms, and whether an operating partner adds real value beyond the capital itself.

Adding a layer of gap capital increases total leverage on the deal, and each additional layer typically carries its own approval rights and covenants that the sponsor needs to manage alongside the senior loan for the life of the deal, not just at closing.

If the deal underperforms, gap capital sits in a position that absorbs losses before the sponsor’s remaining equity in some structures, or ahead of the senior lender’s full recovery in others, depending on the specific terms, so the sponsor should understand exactly how losses would be allocated across the stack.

A gap capital request is strongest when the sponsor can show the senior loan terms are already in place or well advanced, along with a clear sources and uses schedule showing exactly where the gap sits and how much capital is needed to close it.