Buy on numbers, not on emotion.
We are not a real estate agency. We are an investment advisory firm. Every property we recommend comes with a full financial model — projected yield, IRR, tax position, exit scenarios. Built for investors who buy on numbers, not on the brochure.
Bring a property — or pick from ours.
Every investor enters from a different point. We meet you where you are.
Analyze a property you found.
You send us a listing. We send back a full investment-grade report: acquisition cost, net yield, IRR, tax position, exit scenarios. Clear recommendation: buy, renegotiate, or walk.
Browse pre-vetted opportunities.
A short, evolving list of properties that already passed our internal screen. Each one comes with headline financials, the investment thesis, and the risks worth knowing.
We sell analysis. Not square metres.
The Costa Blanca property market runs on commission. Agents are paid when paper changes hands. Their incentive is the transaction. Ours is the return on your capital.
Sarah Katerina Investment is paid for analysis, not for closings. We reject more than 70 % of the properties we’re asked to review. The ones that pass come with a full financial model. The ones that fail come with a written reason.
Honest no, when needed — even when it costs us the deal.
Four asset classes. One discipline behind each.
We don’t cover everything. We cover the things we’ve been wrong about often enough to recognise the patterns.
Residential Investment
Short-term rental apartments, beachfront assets, renovation projects. Analysed for tourist licence status, realistic occupancy, net yield, and exit liquidity.
Development Land
Urban and coastal plots with confirmed zoning. Assessed for infrastructure access, planning timeline, and development feasibility.
Commercial Real Estate
Retail units, offices, hotels, warehouses, mixed-use buildings. Evaluated on tenant quality, lease structure, cap rate, and repositioning potential.
Redevelopment Projects
Distressed or undervalued assets with value-add potential. Screened for acquisition discount, technical upside, and realistic exit scenarios.
Five steps. One PDF. 48 hours.
Market & location screen
Comparable sales and rentals within 500 m. Real prices and real occupancy — not portal averages.
Asset-level due diligence
Listing read line by line. Community charges, licensing status, structural notes. Anything off — flagged.
Financial modelling
Cashflow built bottom-up: acquisition costs, gross income, operating expenses, taxes, IRR, payback.
Tax overlay
Modelo 210, wealth tax, treaty credits applied to your specific home country. The number that actually hits your account.
Decision report
Buy, renegotiate, or walk — with the price and conditions that would change the answer. In writing, in 48 hours.
Not a paragraph of advice. A full analytical model.
Every report runs on the same in-house investment engine we built for our own deal flow. A few slices of what arrives in your inbox at hour 48.
Monte Carlo, not point estimate.
1,000 simulations sweep the inputs we cannot know with certainty. You see the probability of an IRR above 5 % and 8 %, the P10–P90 confidence interval, and the downside-loss probability — in writing.
Pricing by month, not blended average.
ADR and occupancy are tuned month by month against comparable rentals within 500 m. Baja, Media, Alta and Pico seasons modelled separately — the part most spreadsheets get wrong.
Real occupancy. Real ADR.
Twelve months of revenue and occupancy plotted side by side. You see exactly which months carry the year, and where summer pricing has to land for the model to clear.
Cashflow and recovery, levered and unlevered.
Annual NOI, OpEx, levered cashflow and the cumulative-recovery curve over a ten-year hold. The break-even month is explicit, not implied.
Real returns, after the world happens.
DSCR and mortgage coverage modelled at the chosen LTV. Real-versus-nominal IRR shown at 2 %, 3 %, 4 % and 5 % inflation — the number that survives, not the brochure number.
€597 · 48 hours · the full file.
One PDF. Every metric, every chart shown above — built on your property’s actual inputs. Clear recommendation: buy, renegotiate, or walk.
Request the analysis →Sample model from a Torrevieja short-term-rental case. Your report uses your property’s actual inputs; the structure of the output is identical.
An analyst’s rigour. A tax insider’s edge.
Sarah Katerina Investment grew out of Costa Larga, the Costa Blanca investment-research practice founded inside the same office. The framework is built by a former Senior Director at SUMA — Spain’s regional tax administration. The tax overlay isn’t a footnote in our reports. It is the part most firms get wrong.
Read about Sarah →Three deals. Three outcomes.
Real cases from Sarah Katerina Investment clients — names with permission, results verifiable on a call.
“The diagnostic flagged a Modelo 210 miscalculation that would have cost me €12,400 over three years. We renegotiated the purchase structure before signing the arras. Best €347 I have spent on this whole purchase.”
“I was ready to sign on what looked like a great buy-to-let. The 48-hour analysis showed the net yield was 2.3 %, not the 7 % the agent had promised. I walked away. Saved a €280,000 mistake.”
“My Irish lawyer is excellent but doesn't know Spanish tax. Sarah filled the gap exactly — ITP, Modelo 210, wealth-tax exposure, all in writing before I committed. Twenty years inside the tax authority shows on every line.”
We don’t stop at the report. We’ll close it too.
When the analysis says buy, we hand the file to the rest of Sarah Katerina Group: Property Purchase handles NIE, due diligence, notary and registry. Tax Advisory files Modelo 210 and the rest of the lifecycle. VITA Host operates the asset if you’re holding it for rental.
One brief, one team, one accountable point of contact. No handoffs to strangers, no translation tax, no surprises at the notary.
Whatever stage you're at, let's talk.
A 30-minute discovery call is free and clarifies more than any email chain.