One Development is a residential developer based in Marbella, founded by Mihail Guscin — someone who has spent over a decade building a clear idea of what makes a home worth living in.
The company exists because residential development in most markets defaults to the average. One Development does not. Each project is chosen deliberately, designed with conviction and executed with the same hands-on rigour that private clients expect from a bespoke commission.
Founder & CEO — 11 years in premium design, interiors and real estate
Mihail started in premium interiors in 2013, working directly with private clients on high-specification residential projects in Latvia. That experience gave him an unusually granular understanding of what separates a well-built home from one that merely looks the part.
Over the following decade, he completed 8 development projects totalling more than 35,000 square metres — each one managed with the same rigour and material selectivity he applied in his interior work. Those years built lasting relationships with premium European manufacturers — from kitchens and lighting to stone and cabinetry — that One Development continues to draw on.
Marbella is not a pivot — it is a progression. The Costa del Sol offers a market where architectural ambition and investment discipline can meet, and where the standard of delivery that One Development holds itself to is both possible and valued.
Years of working on private residential commissions taught us something that most developers prefer to ignore: the decisions that matter most are made early — in the brief, the concept, the material specification.
By the time a building is finished, the character of the home has long been determined. That is why One Development treats the design and planning phase as the most critical part of the process, not a preamble to construction.
We do not add quality at the end. We build it in from the start — which is why our projects hold their standard throughout, rather than peaking at the render and fading at handover.
"The best homes are not the ones that impress on first sight — they are the ones that keep giving years after you move in."
Site acquisition — location, orientation, planning potential, neighbourhood trajectory
Architectural concept — structure, volumes, light, indoor-outdoor flow
Material and interior specification — each room, each surface, each detail resolved
Construction — managed in-house, with direct oversight at every stage
Delivery — fully finished, as designed, with no compromise at the finish line