Own several rentals with low-rate firsts and low LTVs? How a second mortgage on each one works, how CLTV is figured per property, and what a lender checks.
If you own several rentals, each with a low-rate first mortgage and a low loan-to-value, you can pull equity from the properties that have room and leave every first mortgage alone. The tool is a second mortgage, a lump sum or a line of credit, on one or more of the rentals. Each second is its own loan, sized by the equity in the property that secures it.
The alternative is a cash-out refinance on each property, which replaces each first and moves every balance to today's rate. This guide shows the difference in dollars, how CLTV works property by property, and where a portfolio loan fits instead. It covers non-owner-occupied investment property only.
A second mortgage is secured by the property it records against. A second on Rental A is a lien on Rental A, behind that property's first. It does not touch Rental B or Rental C. So the question for each door is separate: how much equity does this property have, and how much of it can a second take?
Your first mortgages stay as they are, each with its own balance, rate and payment. You add a new loan, with a new payment, for every property you take a second on. That is the cost of the approach, so count the payments before you start. The pros and cons guide covers the trade-offs.
The limit on a second is combined loan-to-value (CLTV): every lien on that property, including the new one, divided by that property's value. Fannie Mae's Selling Guide says a lender must consider all subordinate liens secured by the subject property when calculating CLTV (B2-1.2-04, page dated 08/06/2025, accessed 2026-10-07). Equity in Rental A does not offset debt on Rental B.
The formula: value x CLTV limit - first mortgage = room for a second. Here it is for three rentals at an 80% limit, the top of typical USA Mortgage terms. These are example numbers, not a quote.
Total room on the two that fit: $140,000 + $114,000 = $254,000. Those are the most you could borrow, not what you should borrow. Use the second mortgage calculator to run each property with your own numbers.
Take the same A and B. A cash-out refinance to the same 80% limit means a new first on each:
The new money is the same either way: $140,000 + $114,000 = $254,000. The difference is what gets repriced. With cash-out, $280,000 + $224,000 = $504,000 moves to the new loans' rates, including the $250,000 you already owed. With two seconds, only the $254,000 is new debt, and the $250,000 of existing firsts keeps its rates.
If your firsts carry rates well below what you could get today, that gap is the reason to take seconds. If a first carries a rate above today's market, refinancing that one may make more sense. You can mix: a second on some doors, a refinance on others. See second mortgage versus cash-out refinance for the single-property comparison.
Each second is secured by one property, so each is sized on its own. Typical terms, subject to underwriting:
A lender may use an automated valuation (AVM) and still require a full appraisal, depending on the findings and the LTV. Every loan is conditional on the borrower and the property, and some files may be placed with partner lenders.
Beyond the terms, check three things yourself before you apply:
A second on Rental A rests on A's equity alone. Taking seconds on several rentals means several separate loans and several separate closings, each tied to its own property and its own first. That keeps the sizing simple, since every CLTV calculation stands alone, and it keeps each property's debt separate from the rest. The cost is paperwork and payments multiplied by the number of doors. USA Mortgage sets no limit on how many second mortgages one borrower can have with us, so the equity and the cash flow on each rental set the number. Some lenders cap it, so ask any other lender how it handles more than one second at a time.
If a rental is owned free and clear, there is no first mortgage to work around, and USA Mortgage can lend on it in first lien position. One thing to plan for on every property with a first: if you later refinance a first, the second-lien holder generally has to sign a resubordination agreement. Fannie Mae's guide requires one when subordinate financing stays in place on a first mortgage refinance, with an exception where state law lets the second keep its position (B2-1.2-04). Several seconds means several of those if you refinance several firsts. The lien position guide explains why order matters. If the cash is for a down payment, see using rental equity for your next down payment.
A portfolio, or blanket, loan is a different product. It puts a group of properties under one loan with one payment, instead of a mortgage on each (see portfolio / blanket loan). It replaces your existing firsts rather than sitting behind them, so it makes sense when the firsts are not worth keeping, or when you want one payment. USA Mortgage's portfolio loan program is a separate program with its own typical terms, listed on that page. The scaling guide and the portfolio refinance guide cover that route.
The rule of thumb: if the firsts are the asset, keep them and take seconds. If the firsts are the problem, replace them.
Business-purpose lending only, on non-owner-occupied investment property. Not a commitment to lend. Terms shown are typical and subject to underwriting. Worked examples use illustrative numbers, not quotes. This is general information, not legal advice.
Rates, leverage, and timelines mentioned in this guide are typical figures, subject to underwriting and market conditions. Not a commitment to lend. Nothing here is legal, tax, or investment advice.
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