When a client is short on credit, everyone asks for the same thing: a relative in Florida willing to sign for an apartment they will never live in. That person usually does not exist — and when they do, they are slow. Here is the full comparison.
Because the form describes somebody who mostly does not live here: a US resident with strong credit and enough income to carry their own housing plus three times your client's rent, willing to attach their credit report to an apartment they will never walk into.
Look at who is actually applying. 54.5% of Miami-Dade residents were born outside the United States, and the relatives with the strongest finances are usually still in the country the client came from. A co-signer abroad is rarely accepted here, which means the search is not difficult — it is closed before it starts, and your client spends a week finding that out.
The ones who do live here get a test of their own. They are underwritten as if they were renting a second apartment: their income has to clear the same 3x ratio on top of whatever they already pay to live. A brother-in-law with a mortgage and a decent job fails it routinely, and he finds out in front of the family that asked him.
The ask is not administrative. You are telling somebody who is new here, and already stretched, to call a relative and request tax returns, pay stubs and permission to pull their credit, for a home that relative will never live in. Plenty of clients will simply say they are working on it. What that sentence means is that they have not asked yet, and would rather lose the unit than make the call.
That is the part that costs you the deal, because from your side nothing looks wrong. The client is responsive, the file is nearly done, the documents are coming. Meanwhile the median unit is gone in 33 days and the other applicants are not waiting on anybody's uncle. You learn it was never coming on the day the listing agent tells you the unit is leased.
A co-signer is a favour asked of a third party who owes the lease nothing. That is not a weak solution. It is a solution that depends on somebody who never agreed to be part of your deal.
Sources: RentCafe (Miami rental competition and occupancy, 2025); U.S. Census Bureau, ACS 2020-24 (Miami-Dade demographics and rents); CFPB (credit invisibility).
| What it costs you | Asking for a co-signer | Grenty |
|---|---|---|
| Time to an answer | Days of calls to a third party who has to gather tax returns, pay stubs and a credit report for a lease they will never live in. | Handled with your client directly, in minutes of their time, not weeks of somebody else's paperwork. |
| Clients it leaves out | Requires a US person with strong credit and enough income to cover two households at once. Most of your clients do not have that person. | Built for the applicant who is qualified in real life and unreadable on paper. No relative required. |
| Client with no US credit | A relative abroad is usually not accepted, and the national programs that do accept these files charge a premium for the missing history. | This is the case it was built for: real income, real references, and a FICO score that does not exist yet. |
| How the file reads at the building’s board | One more person for the board to screen, one more set of documents, more time on a calendar that already runs two to three weeks. | One applicant, one complete file, with institutional backing behind the rent. The board still decides, but it decides on something solid. |
A co-signer is a favour your client has to ask. A file is something you can build.
Ask the real question. Not whether they have somebody. Whether they have already asked them. The distance between those two answers is usually two weeks of your time.
Date the ask. If the documents are not in your hands by a day you both named out loud, you move to the alternative. Momentum is the asset here.
Keep the client whole. The person you push somebody to ask a favour of is the person who stops answering. Your client still needs that family after the lease is signed.
Your client's uncle sends tax returns, a credit report and a signature. On paper the lease is covered, everyone relaxes, and the file is closed.
Nothing re-checks that co-signer after closing. He can move states, lose the job, file for bankruptcy or simply stop answering, and the lease never finds out.
The owner calls the number on the co-signer's file a year later. That call is where he finds out what happened to the person behind the rent.
Grenty is not a relative, it is an agreement: it responds on the terms written into it, one payment from $399 that stands for the entire lease.
Move the same day, and do not re-submit the same file. A second application with nothing changed buys the same answer twice, at another fee per adult — and by then your client is paying to be told no.
Know what the alternatives charge before you recommend one. The national programs that accept these files price the missing history directly: one of them charges 70 to 90% of a month's rent to applicants with US credit, and 98 to 110% to applicants without it. For an international student it asks for a responsible party abroad earning fifty times the monthly rent. That is not a screening standard. That is a fee on the passport.
Rent Protection starts at $399: one payment, made once, covering the entire lease instead of repeating every month, for rents up to $2,000 a month, with pricing that varies above that. Who pays is settled between the parties — sometimes the renter, sometimes an owner who wants the unit filled this week. What it replaces is neither the screening nor the decision. It replaces the search for a relative willing to underwrite somebody else's home.
The practical difference for you is that this is a number you can say out loud at a showing. A co-signer is an open question with no date and no figure attached; you cannot schedule around it and you cannot tell an owner when it resolves. An option with a price and a timeline turns a stalled file into a decision your client can actually make, and in a market with 19 applicants per unit, a decision made today is the only thing that moves.
Use them if it moves fast. The question is not whether a co-signer works, it is whether the documents arrive before the unit does. With 19 applicants per unit, the relative who answers on Thursday has already cost you the listing.
Not really. A co-signer is one more individual to evaluate, chase and eventually pursue. Institutional backing is a process the owner does not have to manage. For an owner already paying $1,900 a month in building fees, that difference is the point.
Signing is the beginning, not the end. A co-signer is evaluated once, the day the paperwork goes in, and nobody looks at that person again. They may have moved, lost the job or ended up somewhere else entirely by the month it actually matters, and the landlord finds out right then. Grenty is not a relative with a signature: it is a written agreement that answers on its own terms for the length of the lease.
Rarely, and almost never in time. US screening reads US income, US filings and a US credit file, and a co-signer in Bogotá or São Paulo has none of the three. The national programs that do accept somebody abroad ask that person to show fifty times the monthly rent in income. Most families do not clear it.
The right to chase a second person. That is the whole product: if the rent stops, the owner now has two names to pursue instead of one, through the same courts and the same calendar. It is a promise to litigate later, and an owner already carrying $1,900 a month in building dues feels every week of that.
Not on its own. Screening reads income documented in the applicant's name, and money arriving from abroad each month reads as a transfer rather than as earnings. It is real support and it should be documented, but it does not answer the ratio the form is asking about. The file still needs something standing behind the rent itself.
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