Austin’s affordability crunch, combined with a growing population, has fueled an apartment-building boom in and around the city. Slightly more than half of Austin-area residents are renters, and nearly half of them are paying what are deemed “unaffordable” rents, as the Austin Business Journal previously reported in a January cover story.

So how many more apartment buildings could Austin conceivably hold? Roughly 5,210, according to the number crunchers at RealMassive, an Austin-based company that has developed a robust real estate data analysis platform.