EXCLUSIVE

Ain't no rager like a Snapchat rager -- the social media company is commandeering one of L.A.'s most popular landmarks for the office party to end all office parties. Doggy-face filters for everyone!!!

According to docs obtained by TMZ ... Snap is closing down the Pacific Park on the Santa Monica Pier on June 16 -- a Saturday, no less -- for its annual event for employees and their families. Thousands are expected to attend the 5-hour, invite-only bash which is slated to begin at 11 AM.

The party will be catered with an open bar, of course, under about 2 dozen tents. Snapchat's also taking care of all Uber/Lyft rides to and from the event. It's unclear what the total tab is for this shindig, but renting out the 2 acres alone will cost around $100k. The company also has to cover costs for every vendor on the Pier.

TMZ broke the story ... Snapchat dropped around $4 mil to rent out L.A. Live on New Year's Eve.

Timing of the Pier bash is interesting. It comes a few months after Snap instituted a third round of layoffs as part of its "strategic restructuring." CEO Evan Spiegel reportedly said he wants the company to be profitable by the end of 2018.