A mixed-use property combines residential space with some non-residential use in the same building — classically, ground-floor retail or office space with apartments above. Residential mortgage lending is built around properties that are predominantly residential, so the underwriting question is whether the residential component is clearly the majority of the building's use and value, or whether the commercial component is substantial enough to push the property out of standard residential lending and toward commercial financing instead.
Exactly where that line falls is set by individual lenders and insurers, and it can move — treat any specific percentage you've heard quoted as something to confirm with the lender you intend to use, not as a fixed industry-wide rule you can rely on across every deal.
Beyond the raw split of space, lenders and insurers also look at what the commercial space actually is. A quiet professional office is a very different risk than a restaurant with a commercial kitchen, or any use involving flammable materials, heavy equipment, or activities that could affect the building's insurability or the residential units' livability. Two properties with an identical square-footage split can be treated quite differently depending on what's actually operating downstairs.
This is worth asking about directly rather than assuming from a listing description — "commercial space" covers an enormous range of actual uses, and the specific tenant matters to how a lender views the file.
A property previously used as an unlicensed cannabis growing operation or a clandestine drug lab carries a distinct kind of stigma risk, separate from any question of the current owner's honesty. These uses can cause real, sometimes hidden damage — electrical system modifications, mould from excess humidity, chemical contamination — that needs to be professionally assessed and remediated, with documentation, before a lender or insurer will treat the property as a normal residential asset again.
Even with a documented remediation certificate in hand, some lenders and insurers maintain a blanket policy against ever financing or insuring a property with this history, regardless of the remediation's quality — this is a lender-specific risk appetite, not a universal rule, and it means a property with an otherwise clean remediation record can still need a more selective search for financing than an equivalent property without that history.
Where a property's history as a former grow-op, lab, or other stigmatized use is known, disclosing it is a legal and professional obligation that sits with the seller and their representatives, not a detail to be managed quietly to keep a deal moving. As a mortgage professional, submitting a file while aware of a known, undisclosed material issue exposes you to exactly the kind of file-integrity problem covered later in this course's companion module on fraud and file integrity — treat known history as something to surface, document and work through, never as something to leave out because it complicates the file.
The right response to a known issue is always to address it — get the remediation documented, find a lender genuinely willing to consider the file, and be straightforward with the client about the narrower options — not to quietly walk the file to a different broker or lender hoping the history goes unnoticed.
A broker learns, partway through a file, that the property was a documented former grow-op with a remediation certificate on record. What is the correct next step?
A documented history like this needs to be disclosed and worked through openly — some lenders will still decline regardless of remediation quality, which is exactly why finding the right lender, rather than hiding the history, is the professional path. Omitting known material history is a file-integrity failure, not a shortcut; and the property is not permanently unfinanceable, just more selective, so steering the client away entirely overstates the problem.
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