The important thing to understand, the community occupancy number, the vacancies are vacant lots. Lots that exist in the community that are not earning revenue. So all of the homes in the community are occupied, right? Whether it's a rental home or a resident-owned home, those are occupied units, right? So that 86-point-something percent occupancy consists of our 10,000 rental homes that are occupied plus community resident homes that are occupied.
But the 14% vacancy is lots that exist. They physically exist. They have driveway. They have water and sewer. They're on road. And all they need is the addition of the house. And so during the many years, going back to about 2006, we intentionally acquired communities with vacancy, buying lots for as little as $30,000 per site because they were vacant. And then we added $70,000 rental homes to that lot, so that for $100,000, we create 1,000 square foot, 3-bedroom, 2-bath dwelling unit on a 5,000 square foot lot that will rent today for about $1,000 per month.
So we're basically building horizontal apartments where our cost per lot roughly ranges from $30,000 to $70,000 when you're buying them, you build them for about $100,000. And then we're adding that factory-built house that's an incredibly efficient quality, energy-efficient house, and then we're renting it out. And because this product is as good as any apartment, but costs less, we have these waiting lists, and we have that strong rental occupancy. And so we ran into problems when COVID closed down the factories and we couldn't get the homes. So that was the problem.
That year, we were able to -- the next year, we were able to get our 5% rent increase, but we couldn't tell you that we added 800 rentals and filled them, because they didn't come from the factory. And the year that followed that, the homes all came from the factory all at once, so the first half of the year, we had to set them up, and then the second half of the year, we rented them. And now we're in the next year. And all of those problems that are behind us are now behind us. Everything is back to normal. We have 3,000 vacant lots to fill by getting the home from the factory, setting it up in 2 to 3 months, and renting it out. So that 14% vacancy should be filled over the next 4 years.