A great rundown on LC-48 by Anthony Iemole for NASASpaceflight.com:
The 10-acre complex is situated about one mile southeast of LC-39A, and one mile northwest of SLC-41, home of United Launch Alliance’s Atlas V rocket. Pad 48 is what’s known as a “clean pad” design, meaning it gives multiple users, all with different launch systems, the ability to launch from the complex. This is part of NASA’s ongoing effort of encouraging commercial spaceflight development.
I expect to see Astra and ABL flying from this location in the not-too-distant future.