Build Block

A Seoul boardroom, a job site in Texas, one company in between

Somewhere in Seoul, a Korean manufacturer signs off on a new U.S. plant. Six thousand miles away, in Texas or Silicon Valley, crews are already grading the lot. The two events used to be separated by months of confusion - foreign brokers, mismatched permits, contractors who never returned the call, accountants in two time zones who never spoke. Build Block put a single company in the middle of that gap and called it a service.

That is the version of Build Block that exists now: not a listings website, not a fund, but an operator. It searches for the property, designs the building, pulls the permits, acts as the general contractor, and then sticks around to manage the lease, the maintenance, the local tax filings, and the foreign-exchange paperwork back in Korea. For a Korean company moving to America, it is the difference between a project and a headache.

Cross-border real estate was a trust fall across an ocean

Here is the awkward truth about buying property in another country: the listing is the easy part. An investor in Seoul could find a building in Los Angeles in an afternoon. Closing it, financing it, renovating it to code, leasing it, and reporting all of it correctly to two governments - that could take a year and a small army of intermediaries who didn't know each other.

For individual Korean investors, the barrier was higher still. There was no credible intermediary to hold the whole thing together. You either had the scale to hire a global firm, or you didn't go. Build Block's original idea was almost financial: lower the minimum, lower the barrier, let ordinary investors reach U.S. real estate the way only institutions could. The information gap, not the money, was the enemy.

An engineer who'd already built Google's headquarters

Jimmy Jung is not the obvious person to start a real estate company, which is exactly why it worked. He studied civil engineering at UC Berkeley, took a master's in management science and engineering at Stanford, and then spent time as a project manager on the construction of Google's new headquarters. He had stood on the unglamorous side of real estate - the side with the schedule, the subcontractors, and the building inspector.

His bet, made when he founded the company in 2018, was that cross-border real estate would never be solved by software alone. Someone had to own the physical work. So he assembled a team with the same dual instinct: a CTO with time at Lyft and Intel, a COO to run operations, engineers who could speak both Korean business and U.S. building code. The wager was that clients would pay a premium for one accountable partner instead of a chain of strangers.

Eight service lines, one accountable partner

What Build Block actually sells is integration. Each of these exists somewhere else as a standalone business. The trick is putting them under one roof so a client never has to translate between them.

Capital, geography, and a partner who handles the money

Talk is cheap; concrete is not. Build Block has raised roughly $14.4 million to date, including a Series A in 2022, and built an operating footprint across five U.S. markets - Silicon Valley, Los Angeles, Hawaii, New York, and Texas. That is an unusual spread for a company of around forty people.

The clearest validation came in 2023, when Mastern America - the U.S. arm of Korea's Mastern Investment Management - signed an MOU to pursue large-scale commercial development together. The division of labor says everything about Build Block's role: Mastern handles financing and asset management, and Build Block handles construction oversight and regulatory compliance. A money house chose Build Block to be the one holding the hard hat.

Make a foreign building feel like a local one

Strip away the service lines and the mission is simple: lower the barrier to cross-border real estate so thoroughly that investing or expanding abroad feels like doing it at home. The original promise was about access for individuals. The current promise is about accountability for companies. Both come from the same place - the conviction that the missing piece was never capital, it was a trustworthy operator in the middle.

It is, admittedly, a deeply unglamorous mission. Nobody writes songs about foreign-exchange reporting or tenant management. But those are precisely the things that kill deals quietly, and Build Block decided the unglamorous middle was the business worth owning.

The AI era needs rooms, and someone has to build them

Reshoring is the word of the decade. Supply chains are being redrawn, and Korean firms in semiconductors, batteries, and advanced manufacturing are pouring into the United States. Every one of them needs the same unglamorous thing: a fab, a plant, a data center, sited and permitted and built on American soil. Build Block has quietly aimed its general-contractor machinery at exactly that - including the AI data centers and power infrastructure the next decade will run on.

So return to that Seoul boardroom. A manufacturer signs off on a U.S. plant, and crews are already grading the lot in Texas. A few years ago that synchronization was a fantasy held together by frantic emails. Now it is a workflow with a single company answering for it. Build Block didn't make U.S. real estate simpler. It just made sure one phone number could be held responsible for all of it - which, for anyone who has tried to build six thousand miles from home, is the only kind of simple that matters.