I have to ask - what's yours? They call the police. Or a private security firm. Escort us from the premises and file a complaint. Only now they are aware that someone is poking. At least in my proposed scenario we have access to their (nominal, in charge of mundane-ish parts of the operation) leader.
I feel that you overestimate how well we can pass for a building inspector. Also, you don't account for hostages. As in, all the mortals in the complex are, or can be used, as hostages. If we at least get in a room alone with someone in charge, that's mitigated a bit. Like this? Yeah, we might walk away, but we are putting ourselves in a position of weakness.
We are near the maximum of how intimidating someone can be at 14-16 effective dice. Unless he has perfects (possible, but unlikely), I feel it's reasonable to expect that we can, in fact, do it.
EDIT:
I mean, ideally, we'd force an evacuation of the building. Cause an electrical short (or, better yet, simulate one). Maybe imitate an earthquake (would Lydia be up to it?). Do something to get people out before we start the direct confrontation. Hmm...
@DragonParadox do they keep their servers on-site and who does the maintenance / administration?
1)They have no security by WoG. If they had private security they would be on site, not on phone call.
And we know they have no particular influence with the local police department.
2)I am confident of Molly's ability to Excellency her way out of trouble with mortal officers for something as minor as trespassing. When Dresden and Michael got arrested for trespassing on a hospital's nursery in Grave Peril, they were released the next morning and no charges were filed.
I am not confident of Molly's ability to intimidate unknown supernaturals in their place of power.
3)Plan A is entering the closed wing in search of whatever they brought onsite and forcing the issue.
Plan B is bringing Michael and the Sword into those ritual sites we have identified on the map and seeing the reaction.
Plan C is using the Crown on those sites once we are inside them and can see/perceive them with our own senses.
Plan D is setting off the fire alarm and let the sprinkler system send running water through a bunch of ritual sites, disrupting magic.
Plan E is getting the place evacuated by calling in an anonymous bomb threat.
4)I am trying to move fast enough to make the issue moot.
If he has additional forces on site, they are in the closed wing, and interdicting that removes the hostage contingency.
You are proposing sitting in his office and giving him time to do things like send telepathic messages to any forces he has around or just press buttons under his desk to activate a silent alarm.
5)Molly's father Michael is a carpenter and building contractor. He has professional experience with them.
I have complete confidence in their collective ability to look like a building inspector team if its necessary, even without magic.
6)No we are not.
An intimidation-specced Infernal would have Manipulation or Charisma 5, Intimidation 5 and Excellency 10 for 20 dice of social.
At chargen. Before charms.
We're okay. We're not anywhere near close to maxed out.
7) To give you my perspective?
W20 rules allow a Fomor to have superhuman Attributes if necessary. A Fomor with Charisma 8 and Subterfuge 5 has 13 base dice.
Five foot four Justine went from being manhandled by random vampires to punching through steel when she was invested by Nemesis, and Papa Raith got enough magic immunity to ignore the Blackstaff after doing a deal with an Outsider.
Some of these things have a lot of power to throw around.
Or, just sticking with ExWoD, and looking at the options available to major servants of major baddies?
ExWoD rules for Infernalist Exalts(and presumably anyone who has sufficient favor) that have sold their souls gives them
-Righteous Lion Defense free
-Immunity to mind control except by their master,
-Inhuman Potential, which raises their Attribute cap to 8, and Ability cap to 6, for a max of 14 dice.
In addition, Pearl Teeth and Amber Eyes Treatment, found in both ExWoD and Kindred of the East, gives 4 dots to distribute between Charisma and Appearance and another 8 dots to distribute between Empathy, Etiquette and Expression.
This is an agent of an Old One, from an apparently multigenerational family of cultists, that has been in his service, or under the influence of whoever is in his service, for decades. And important enough to be in charge of a breakout attempt.
You have no idea what he's walking around with under the hood.
Assuming we can just walk in and wave our dick around is unwise.