Tesla’s 870,000 sq ft building in the city of Lathrop, CA continues to take shape, with the massive and rather mysterious facility’s roofing now being complete. The new Lathrop site’s progress comes amidst the electric car maker’s efforts to produce and deliver as many vehicles to customers before the end of December.

Tesla enthusiast and drone operator Troopr1023 noted in a YouTube upload that the facility is significantly more refined since his last flyover, which was conducted last November 18. During that time, the large building only had around 2/3 of its roofing installed, and there was very little work being done around the facility.

Apart from its full roofing, the areas of the facility where its numerous loading bays are located are now being overlaid with cement. A parking lot located in what appears to be the facility’s front end is also being constructed. The drone operator did note, though, that the spaces allotted for parking lots immediately around the site are rather few; thus, giving the impression that the facility would likely have relatively few employees.

Tesla is yet to disclose the purpose of the Lathrop facility, though speculations are abounding that the site might be used as a distribution center. Considering that the structure is built with numerous loading bays on each end, and considering that the size of each bay seems to be designed to fit a semi-trailer, it does seem plausible that the structure would be used in connection with Tesla’s vehicle distribution activities.

Even prior to the construction of the 870,000 sq ft building, Tesla’s presence in Lathrop was already notable. Local news agency Manteca Bulletin, for one, noted that the upcoming facility would be complimenting a 500,000 sq ft Tesla-owned site in the city. Lathrop is also home to one of the electric car maker’s loading hubs, which holds vehicles before they are shipped to other locations.

Tesla’s progress in the construction of the Lathrop facility comes amidst the company’s efforts to produce and deliver yet another record number of vehicles this quarter. The electric car maker defied the odds in Q3 by posting a $312 million profit, and since then, Elon Musk has noted that Tesla should remain cash-flow positive in the coming quarters as well. With the end of Q4 at hand, and with the $7,500 federal tax credit set to expire at the end of the month, Tesla CEO Elon Musk has been encouraging potential buyers to purchase an electric car today.

Tesla has released all cars for sale where original customer can’t take delivery before year end, as well as test drive / display cars, which cost less. Reminder to US buyers that $7500 tax credit drops in half in 8 days. Order online at https://t.co/46TXqRrsdr or visit stores. — Elon Musk (@elonmusk) December 22, 2018

In a recent series of tweets, Musk noted that Tesla is releasing inventory, display, and test drive vehicles for purchase. Musk even noted in a recent tweet that these vehicles, as well as cars that belonged to reservation holders who couldn’t take delivery before the year ended, would cost less. The bold CEO further added that orders for the Mid Range Model 3 should be delivered by the year’s end.

Perhaps most notable, though, was an announcement that Musk recently made about the $7,500 federal tax credit. When asked by a Mid Range Model 3 reservation holder what would happen if an order is not fulfilled before the end of December, Musk noted that Tesla would cover the tax credit difference.

If Tesla committed delivery & customer made good faith efforts to receive before year end, Tesla will cover the tax credit difference — Elon Musk (@elonmusk) December 22, 2018

While Tesla is making progress on its US facilities and deliveries, the company is already laying the foundations for an even more aggressive ramp next year. In Europe, for example, reports have emerged that Tesla is preparing to ship 3,000 Model 3 per week for the region. The rollout of CCS-compatible Superchargers for the Model 3 have also begun. On the other side of the world, Gigafactory 3 in China continues to take shape, with local reports stating that the facility is progressing “one year ahead of schedule.”

Watch the Lathrop facility’s latest drone flyover in the video below.