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We have performed a 1.3 centimeter survey of 24 massive young stellar objects(MYSOs) using the Expanded Very Large Array (EVLA). The sources in the sampleexhibit a broad range of massive star formation signposts including InfraredDark Clouds (IRDCs), UCHII regions, and extended 4.5 micron emission in theform of Extended Green Objects (EGOs). In this work, we present results forG35.03+0.35 which exhibits all of these phenomena. We simultaneously image the1.3 cm ammonia (1,1) through (6,6) inversion lines, four methanol transitions,two H recombination lines, plus continuum at 0.05 pc resolution. We find threeareas of thermal ammonia emission, two within the EGO (designated the NE and SWcores) and one toward an adjacent IRDC. The NE core contains an UCHII region(CM1) and a candidate HCHII region (CM2). A region of non-thermal, likelymasing ammonia (3,3) and (6,6) emission is coincident with an arc of 44 GHzmethanol masers. We also detect two new 25 GHz Class I methanol masers. Acomplementary Submillimeter Array 1.3 mm continuum image shows that thedistribution of dust emission is similar to the lower-lying ammonia lines, allpeaking to the NW of CM2, indicating the likely presence of an additional MYSOin this protocluster. By modeling the ammonia and 1.3 mm continuum data, weobtain gas temperatures of 20-220 K and masses of 20-130 solar. The diversityof continuum emission properties and gas temperatures suggest that objects in arange of evolutionary states exist concurrently in this protocluster.

First Results from a 1.3 cm EVLA Survey of Massive Protostellar Objects: G35.03+0.35