Castlelake has priced its first residential mortgage-backed securities issuance, a $261.3 million transaction backed by residential transition loans, or RTLs. The deal comes four months after the alternative investment manager acquired majority ownership of Resfin Partners, the parent of correspondent platform Eastview and direct lender Lendmarq.
Castlelake first developed a multiyear loan-purchasing relationship with Resfin, then bought control of the company’s origination channels. It is now connecting that production to its own capital-markets program.
For originators working with real estate investors, the transaction is another sign that bridge, fix-and-flip, and construction lending is becoming more closely tied to institutional underwriting standards and rated securitization execution.
A Revolving Outlet For New Production
Castlelake Residential Mortgage Trust 2026-RTL1 is initially backed by 327 loans with an aggregate unpaid principal balance of $223 million across 23 states.
The loans are generally first-lien, fixed-rate, interest-only balloon mortgages with original terms of 12 to 24 months. They finance residential properties that investors intend to acquire, renovate, and either sell or retain.
The initial pool has a weighted-average FICO score of 742, a weighted-average loan-to-cost ratio of 60.8%, and a weighted-average loan-to-as-repaired value ratio of 63.9%, excluding loans for which the respective measurements were zero.
More significant for Castlelake’s future lending capacity is the transaction’s 24-month revolving period. As loans repay, additional eligible loans can be placed into the securitization, subject to credit and concentration requirements.
Those requirements include a minimum weighted-average FICO score of 730, a maximum weighted-average loan-to-as-is value ratio of 75%, and a maximum weighted-average loan-to-cost ratio of 75%.
The structure therefore does more than finance a static group of existing loans. It gives Castlelake a repeatable outlet for qualifying RTL production over the next two years, potentially supporting additional volume through Resfin’s lending channels.
From Loan Buyer To Funding Platform
Castlelake’s acquisition of Resfin moved the investment manager closer to the point of origination in business-purpose and investor lending.
Eastview operates as Resfin’s correspondent channel, while Lendmarq originates loans directly to residential real estate investors. The platforms source RTLs, single-family rental and debt-service-coverage-ratio loans, ground-up construction financing, and multifamily bridge loans.
Resfin will serve as both servicer and loan administrator for the new securitization.
“This RMBS issuance represents an important milestone for Castlelake’s capital markets program and our residential transition loan strategy,” said Armin Rothauser, partner and head of capital markets at Castlelake.
The deal effectively connects several parts of the lending chain under Castlelake’s control: loan sourcing, aggregation, servicing, asset management, and capital-markets execution.
Castlelake has been pursuing a similar strategy elsewhere in the non-agency mortgage market. Days after announcing the Resfin investment, the firm formed a joint venture with Redwood Trust that contemplates purchasing as much as $8 billion in prime jumbo loans sourced through Redwood’s Sequoia correspondent platform.
Together, the transactions show Castlelake building programmatic access to mortgage assets across both prime jumbo and business-purpose investor lending.
Rated Capital Gains Ground
CLRES 2026-RTL1 includes four rated note classes. Morningstar DBRS assigned ratings ranging from A (low) to B (low).
The largest tranche consists of $213.4 million of Class A1 notes carrying a fixed coupon of 5.682% and initial credit enhancement of 22.4%. Castlelake will retain $13.75 million of unrated notes representing a 5% horizontal residual interest in the securities’ aggregate fair value.
The transaction enters a relatively small but increasingly institutionalized securitization sector. KBRA projects approximately $4.8 billion of RTL securitization issuance in 2026, down 12% from $5.5 billion last year. Rated deals, however, are expected to represent approximately 73% of this year’s issuance.
As rated securitization becomes a larger source of funding, originators and correspondent sellers can expect loan eligibility, leverage, borrower credit, property valuation, and exit strategies to receive greater scrutiny.
Institutional capital may provide RTL lenders with more durable financing capacity, but it also places more of the market inside standardized credit boxes.
“Demand for flexible private lending solutions remains strong as residential real estate investors seek capital to acquire, improve and bring housing inventory back to market,” said Lucas Jackson, managing director and head of global residential mortgage finance at Castlelake.
Deutsche Bank Securities served as sole structuring agent and joint lead bookrunner alongside Goldman Sachs. Castlelake said its managed funds and investment accounts will have issued approximately $9.8 billion in asset-backed securities since 2014 following the transaction.
For Castlelake, the securitization completes the funding loop behind its Resfin investment. For originators, it shows where more RTL capital may be coming from and the underwriting standards that production will have to meet to reach it.
