A workable rental property buy box comes down to three numbers, not a spreadsheet full of them: at least $45,000 in equity at purchase, at least $400 a month in cash flow, and an out-of-pocket figure small enough that you keep your reserves. Sarah Kimfila, a Houston-based landlord with roughly 10 doors across Houston, Channelview, Texas City, Pasadena and Amarillo, has used those three filters for a decade, along with a rehab cap that keeps her out of heavy projects.
What follows is how those filters actually behave in the field: how a large equity spread shrinks what a hard money lender asks you to bring to closing, how she got funded in 2015 with a 580 credit score and $25,000 in the bank, why one house rented by the room outperforms anything else in her portfolio, and how she fills vacancies for about $50.
It also covers where the model strains. Ten to fifteen doors with no employees, no written procedures and no bookkeeper produces a specific set of failures, and she named them.
Key takeaways
- Screen deals on three numbers before anything else: $45,000+ in equity at purchase, $400+ per month in cash flow, and total cash to close.
- Cap rehab hard. Kimfila will not buy if the rehab runs over $50,000 and prefers it under $20,000 — she is not a heavy-rehab operator.
- A large equity cushion can shrink what a hard money lender asks you to bring. On a $92K purchase appraising near $170K with a tenant in place, she closed for about $106 out of pocket.
- Reserves can substitute for credit at the entry level. With a 580 score, one hard money lender funded her at 14% because she had $25,000 in the bank.
- A yard sign listing rent, deposit and availability date, priced $20–$25 under neighborhood comps, filled her vacancies in about a week for roughly $50 in marketing spend.
From the Real Estate Pros Show
This article draws on an interview with Sarah Kimfila of Sarah in Real Estate on the Real Estate Pros Show, hosted by Scott Bursey.
The Three Numbers That Decide Every Deal
Kimfila’s rental property buy box has three filters and she applies all of them before she engages with a deal at all:
- Equity at purchase: at least $45,000. No equity, no interest.
- Monthly cash flow: at least $400 after the property is tenanted.
- Out of pocket: how much cash actually leaves her account to close.
She is blunt about why the filters are this simple. “I’m terrible at math,” she says, “but the one thing I’m good at is if the number makes sense.” A mentor gave her the three categories on her first deal in 2015 and she has not changed them since.
There is a fourth constraint that functions as a filter even though she does not list it that way: rehab scope. If the rehab exceeds $50,000 she will not buy, and she wants it under $20,000. That single rule removes most distressed inventory from consideration and keeps her out of the projects where timeline risk and contractor risk compound.
The practical value of fixed floors rather than percentage-based returns is speed. A $45,000 equity floor and a $400 cash flow floor can be checked against a wholesaler’s email in under two minutes. Most listings fail one of them immediately, which means she is not building models for deals she was never going to buy. Her stated fear is not overpaying — it is hesitation. “The longer you take, somebody else already grab it.”
Her hold pattern matches the filters: roughly two to five years, buying with hard money, placing a tenant, then refinancing or selling.
How Equity Cuts Your Out-of-Pocket on a Hard Money Purchase
The third filter — out of pocket — is the one most investors assume they cannot control. In Kimfila’s experience, the equity number drives it.
The Channelview deal she bought roughly three years ago is the clearest example. Purchase price around $92,000. The property appraised near $170,000. A tenant was already in place, the house needed essentially no work, and it projected around $600 a month in cash flow. At closing she paid just over $100 out of pocket — she remembers the figure as $106 — covering taxes and closing items.
The mechanic is straightforward once you see it from the lender’s side. Hard money is priced against the asset, not the borrower’s income statement. A lender looking at roughly $78,000 of spread between price and appraised value, with a paying tenant already in the house, is underwriting a position it can recover in a foreclosure sale. As she puts it: “The hard money lender is going to look at what are the risks. If I’m really having over $60,000 of equity on the property, I didn’t have to come up with anything out of pocket.”
Two honest caveats. This was one deal with one lender in one Texas submarket — it is not a rule you can plan around, and most hard money lenders will still require meaningful borrower cash. And the tenant-in-place factor mattered as much as the equity did; the house produced income from day one with no lease-up gap.
The takeaway is that equity is not just your exit. On the buy side it is negotiating leverage with your lender, which is why the equity filter and the out-of-pocket filter are really the same filter viewed from two angles.
If I’m buying a property and I’m not going to make $45,000 equity on it, and if I’m not going to cash flow $400 or more, I’m not interested.
— Sarah Kimfila, Sarah in Real Estate
Starting With a 580 Credit Score and $25,000 in the Bank
Kimfila started investing in 2015 with a 580 credit score, working at Cargill, freshly out of college. Conventional lenders declined her outright. One hard money lender said yes at 14% interest.
What made the yes possible was cash. She had saved roughly $25,000, and that is what the lender wanted to see. “The lender wants to see how much you have in your bank,” she says. “I will tell anybody, have some money saved in the bank and get your credit in a good place.”
The first purchase was a house in Channelview for about $75,000. She sold it two years later for over $100,000 and rolled the proceeds into the next properties. That single deal funded the beginning of the portfolio.
Her view on the 14% rate is worth sitting with, because it runs against how most investors talk about financing. The rate did not change whether the deal worked. Her contractor finished the rehab in three and a half weeks, and the first mortgage payment was not due for two months — so she collected rent before she ever made an interest payment. “Even if you do pay for a month or two, if the number makes sense, it doesn’t even matter.”
The general lesson for anyone entering with damaged credit: reserves and deal quality can substitute for a credit score at the entry level, and the substitution has a price, usually a double-digit rate. Whether that price is acceptable is a function of your spread and your rehab timeline, not your feelings about the rate. A 14% loan on a deal with a four-week rehab and a two-month payment deferral costs very little. The same loan on a nine-month rehab is a different instrument entirely.
Renting by the Room: When One House Beats Your Buy Box
The single best-performing property in Kimfila’s portfolio does not run on a standard lease. It is a five-bedroom, four-bath house in Spring, Texas that she rented room by room, furnished, and it cash flowed roughly $2,500 to $2,800 a month.
Compare that to her $400 minimum and you see why she calls it her biggest current opportunity.
It started by accident. She and her kids moved from Spring to Katy and left the Spring house fully furnished. A neighbor asked whether her mother could rent a room — she had no furniture. Kimfila said yes. Another neighbor followed. Five tenants eventually moved in, sharing the kitchen and common areas, and the rents from that one house covered the mortgage on her Katy residence.
What the arrangement actually looks like in practice:
- Fully furnished rooms, so tenants arrive with nothing and move in immediately
- Shared kitchen and common living areas
- Month-to-month terms
- Tenants who stayed roughly two years despite the month-to-month structure
The month-to-month point deserves attention. Investors assume short terms mean turnover. In her case the flexibility is what attracted tenants in transition — “I’m going through life right now and I just want to rent a room” — and they stayed anyway.
She is candid that this is one property and a strategy she wants to study further rather than a system she has replicated. Room rentals also carry occupancy, zoning and insurance considerations that vary by city, and furnishing costs and per-room turnover are real. But when a single house produces six times your cash flow floor, it is worth understanding why before you buy the next standard rental.
Filling Vacancies for $50: The Yard Sign Method
Kimfila rents most properties within a week and spends about $50 doing it. The method has four parts and the sequence matters.
- Finish the rehab completely before showing. She does not show half-done houses. Her reasoning is downstream: a property that is fully fixed produces almost no maintenance calls later. Some tenants do not call her until the next year, when she raises rent.
- Put the yard sign up while the contractor is still working. Neighbors and passersby see the work in progress and start calling before the house is even available. Marketing runs in parallel with construction, not after it.
- Price $20 to $25 under comparable neighborhood rent. If the neighborhood rents at $1,200, she lists at $1,175. That small discount is what compresses time-to-lease, and one month of vacancy costs far more than $300 a year in foregone rent.
- Put the numbers directly on the sign. Rent amount, deposit amount, and the date the property is available. By her estimate that screens out 90% of unqualified callers before the phone rings.
She used Zillow earlier and moved away from it. Past tenants also refer family — “they love how I took care of them” — and sometimes a referral fills the house before the sign goes up.
The last step is at lease signing, and it is the one most landlords skip. She walks the tenant through the house and names what is new: the AC, the toilet, the sink. The walkthrough establishes condition on the record, so if a rock goes in the toilet or a window breaks, responsibility is already settled. That conversation is why she can travel for six weeks and not field a dispute.
Where This Model Strains: Contractors, Remote Management, and No SOPs
Ten to fifteen doors run by one person with no employees and no written procedures produces a predictable set of failures. Kimfila named hers.
Cheap contractors. Her most expensive lesson was hiring on price. The work failed within a month — flooring that crumbled under tenants walking on it — and she paid a second contractor to redo it. “Cheaper doesn’t mean that it works.”
Sympathy over screening. Early on she skipped a thorough background check on an applicant with kids who was crying about having nowhere to go. It cost her significantly. Insurance covered part of it. Her broader point is that even applicants who pass a background check can arrive looking for grounds to withhold rent and force you into court.
Remote management by family. Seven of her properties are in Amarillo, managed by her 73-year-old father. They speak once every two weeks. When he hires the wrong contractor, she flies there. She rates operational efficiency an 8 and points directly at this as the reason, along with time spent on tenant calls instead of acquisitions.
No infrastructure. No written SOPs. No bookkeeper — she does the books herself on a mentor’s advice that a bookkeeper eats cash flow. Her own assessment of her financial management is 7.5 out of 10, and she describes the pattern honestly: money comes in, it gets spent, then an AC fails and the repair comes out of savings.
Cash flow is variable, not consistent. During COVID, four tenants moved out in a single month, some leaving the houses in bad condition. In Amarillo an $800-a-month cash flowing property went vacant after three years and needed a full repaint. Texas property taxes and insurance increases compound the pressure, and December is when the checks are due.
Frequently asked questions
What minimum cash flow should a single-family rental produce?
Kimfila’s floor is $400 per month per door, measured after the property is rehabbed and tenanted. That is a fixed dollar threshold rather than a percentage return, which is what makes it usable as a fast screen on incoming deals.
The right number for you depends on your market’s price points and your reserve position. A $400 floor in Amarillo, where she buys cheap and cash flows well, implies a very different yield than $400 in a high-basis market. What matters is that the floor is fixed in advance so you are not talking yourself into a $150 deal.
How much equity should you have at closing on a buy-and-hold rental?
Kimfila requires at least $45,000 in equity at purchase. On her Channelview deal she bought at roughly $92,000 against an appraisal near $170,000 — well above her floor.
Equity at closing does two jobs. It is your exit cushion if the hold goes sideways, and it is what a hard money lender underwrites against, which directly affects how much cash you bring to the table.
Can you get a hard money loan with a 580 credit score?
Kimfila did, in 2015, at 14% interest. Conventional lenders declined her; one hard money lender funded the deal because she had roughly $25,000 in reserves and the numbers on the property worked.
This is her experience with one lender, not a guarantee. Hard money terms vary widely by lender, market and deal. Expect a double-digit rate and expect the lender to look hard at both your bank balance and the equity position in the asset.
How much cash do you need in reserves before a lender will fund you?
There is no universal number, but Kimfila had about $25,000 saved when her first hard money lender approved her with a 580 score. Her framing: the lender wants to see how much you have in the bank.
Reserves serve two purposes on a hard money deal — they satisfy the lender that you can carry the project, and they cover the repair you did not budget for. Her own experience with COVID vacancies and failed AC units is a reminder that reserves are operating capital, not just a loan qualifier.
Is renting a house by the room worth more than a standard lease?
In Kimfila’s case, substantially. Her five-bedroom, four-bath house in Spring, Texas cash flowed roughly $2,500 to $2,800 a month rented room by room, furnished and month-to-month — several times what her standard single-family rentals produce.
The tradeoffs are real: you furnish the house, you manage more individual tenant relationships, and you take on turnover risk per room rather than per house. Room rental also raises occupancy, zoning and insurance questions that differ by jurisdiction, so check your local rules before buying for this strategy.
The bottom line
Write your three numbers down before you look at another deal, and make the out-of-pocket figure the one you negotiate hardest — the equity in the asset is what gives you room to do that with a hard money lender. Then separate the acquisition filters from the operating problem, because a buy box that works at ten doors will not carry you to thirty without procedures, a bookkeeper and someone other than family running your remote market.
