FOURTH AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF APRIL 19, 2018 by and among CORESITE, L.P., AS PARENT BORROWER, CORESITE REAL ESTATE 70 INNERBELT, L.L.C., CORESITE REAL ESTATE 900 N. ALAMEDA, L.P., CORESITE REAL ESTATE 2901 CORONADO, L.P.,...