Raiding a building, a warrant question

[doodle]

I'm writing a story and I was looking for answers to this hypothetical set in NYC. Can anyone shed any light?

Here's the scenario:

During a manhant, a killer has made a phonecall on a cell phone that does NOT have e911 capability, so they can only narrow his location down to within four city blocks from the cell tower.

Circumstantial evidence of a courier delivery points to one building.

At the building a car is seen that matches the description of one from the crime scene but it's well inside the building parking bay on private property and can' be verified.

The people who run the building deny they guy is in the building.

My questions are this:

Is a warrant required to raid the building and search for the doer?

Can I have a situation (which I'd like) where the cops are stuck outside unable to act because no warrant has arrived.

Is a warrant required to gain access to the car?

If a fire broke out could they enter the building for any reason because of this?

Is there any other reason where they could enter the building if permission has expressly NOT been given without a warrant?

Could a cop disguise himself as the courier and deliver the package for example (I assume he would need permission for the courier company)

--

Sorry if this all seems obvious to some people but I'm trying to get this accurate before someone reads the book and yells 'That wouldn't happen!', which, y'know, is gonna happen anyway, lol

[P01IC3M4N]

have one guy go to the front of the building and knock. have another go in back and yell, "help me!" then they can go in to answer the call for help.

why can't they walk over to the car and check the plates? you start threatening people with hindering an apprehension, they'll talk.

[doodle]

lol, I love it! 'Help...!' :D

At the time the car is spotted it's one cop, a large group of armed private security and the building totally private property. They close the doors on the enclosed parking lot, once the first cop on the scene starts snooping around.

So I take it once a fire starts police have a duty to assist?

[Joeyd6]

I'm writing a story and I was looking for answers to this hypothetical set in NYC. Can anyone shed any light?

Here's the scenario:

During a manhant, a killer has made a phonecall on a cell phone that does NOT have e911 capability, so they can only narrow his location down to within four city blocks from the cell tower.

Circumstantial evidence of a courier delivery points to one building.

At the building a car is seen that matches the description of one from the crime scene but it's well inside the building parking bay on private property and can' be verified.

The people who run the building deny they guy is in the building.

My questions are this:

Is a warrant required to raid the building and search for the doer?

Can I have a situation (which I'd like) where the cops are stuck outside unable to act because no warrant has arrived.

Is a warrant required to gain access to the car?

If a fire broke out could they enter the building for any reason because of this?

Is there any other reason where they could enter the building if permission has expressly NOT been given without a warrant?

Could a cop disguise himself as the courier and deliver the package for example (I assume he would need permission for the courier company)

--

Sorry if this all seems obvious to some people but I'm trying to get this accurate before someone reads the book and yells 'That wouldn't happen!', which, y'know, is gonna happen anyway, lol

From a NYPD'er...
1) We do not do any type of manhunts...pursuits yes...manhunts no. We sometimes do a canvass for a perp if we have a specific description.
2) Phones even with E991 capacity give no specific location. Any E991 cell just shows the 991 operator if E991 equipped, what latitude and longitude and address of the cell tower your phone is using. Not the address of the phone. When I ask central where a call back is from she will say: cell site on 42 and broadway. That means yoru phone is on that tower when you called.
3) If we go to a homocide and a witness states the guy who did this was wearing balck jeans and a orange shirt and went south in a red toyota camry.. We "canvass" south and a courrier flags us down and says a man with orange shirt and black jeans was covered in blood and had a knife ran in there from that red car. We would get to the building...surround it....try to evacuate it from very little interior operations...hold a perimeter till ESU responded and they would do a perp search, without a warrant. I have been involved in these. As for the car....we would safeguard ittill a warrant was obtained unless the perp admitted it was his..then we would tow the car for prisoner safekeeping and in which, we could search the car without a warrant. But lets say perp admits its his car...bloodly knife on the seat.....most would safegurad it until a warrant was obtained just to protect the case.
4) The other stuff just wouldn't honestly happen in NY. Would John Q citizen know that...no. But a cop from NY reading it would know right away.
5) We have used courriers with cops to make arrests. No details on specifics but a hypothetical. Mary's credit card is stolen. She reports it. A detective calls teh company and says there has been a $400 order from a onlie retailer. Detective calls the retailer..gets order info and delivery info. Warant is obtained. Shipping comapny gives info due to teh warrant on delivery date (and usually cooperates by giving PD teh package). PD makes the delivery wearing a delivery uniform....has perp sign for item and makes the collar. These are the best collars to watch the perps at the house. They can never believe it.

[doodle]

That's some fantastic insight. Thank you, I'm very grateful.

BTW, manhunt was a poor choice of words on my part, it's just my writer's shorthand. The story revolves around a Detective investigating a homicide. I'm trying to engineer an exciting moment where the building is surrounded but the hero is the only guy in the building facing the killer. It's always a battle matching the drama with reality.