Incall not always possible, and outcall to your hotel difficult also.  Tough situation.   Outcall to your hotel would be fairly safe if the provider is well reviewed.  The elevator card issue is another story.  I saw a provider once where the card was needed to get to her floor, but not to get to lower floors.  She told me to go to certain floor, get off the elevator there and she would come down and meet me.  She did that, we went to different elevator that required the card and went up to her floor.  Problem solved, she didn't have to come down to lobby to get me.

Avoiding the colleagues is a totally different story.  Sorry, but I don't know what to tell you about that one.  If you really want her to come to you, I guess you'll have to take some chances, only you can decide.

Swim

Meet her in the lobby and discreetly give her a room key. Tell her to give you a couple minutes and then come on up.

Very helpful advice. Tough call. Pretty much every hotel I stay in these days has security card entry for every floor. So will have to do like we do in all areas of this fine hobby. Exercise caution and common sense.

Appreciate the feedback.

a different floor is best.

As far as the collegues, if you are really concerned, it is possible to get another hotel room at another location just for your outcall purposes? There are some links on hotels that offer "day" rates (just do a search)

Are there enough people around at any given time so if your colleagues did see you they wouldn't necessarily know you are with that woman?

Have fun & play safe!

Summer

For hotels or club floors is a big problem.  When I find myself in this situation, I make my client meet me outside the hotel or in the lobby.  Once contact is made, we can go to the elevators supposedly as separates.  Does this remove all risk... NO.  You run the unexpected chance of a colleague seeing you in the elevator and seeing her follow you into the room.

If you tell the hotel you are expecting a guest, the hotel becomes far too nosey wanting the guests full information and may ask for her I.D.

You may be better off finding a lady who has incall in the area and taking a cab to see her.

The solution is obvious..

But also more expensive.  

Have her get a room in the hotel.  Then you reimburse her for the expense.  You get an incall and no one goes to your room.  

Course, she's got to trust that you are gonna show up.  Or if you meet her early to give her the money for the room, then you gotta trust her to stay.

Damn, sounds like the hobby where 2 people have to trust the other to do the right thing.

Good Luck

...of security at most of the major hotels in Vegas in case you're planning a trip.

a few floors down where no key access was needed; work colleague (non-elite hotel member) was on a floor below where I met the provider.  Meeting in the lobby was not acceptable in case the colleague was there going to the bar or gift shop.

First, ask for an extra key when you check in. They won't blink but if it makes you feel less nervous make a joke about how you always misplace them in your room.

If it's reasonable for you to be seen at the bar and the bar is empty enough, your date can sit next to you and you can discreetly leave the key in a newspaper, a pack of cigarettes, or whatever is appropriate, placed between you. If it wouldn't be completely out of character for you to chat up a stranger you can even talk as people often do with fellow travelers. I've done this and it is surprisingly exciting to flirt in a seemingly innocent way over a drink, then say "good night" and leave the bar separately, only to meet up 20 minutes later.

For an arms length hand-off, my first choice is to leave a key on the front tire of your rental car if you have one. That works as long as you carefully describe the car and its location. You can even use someone else's car if you are sure they aren't going out that evening.

In every hotel it is going to be possible to find some location where you can leave an extra keycard, whether outside or inside. In a planter, behind a trashcan, under the ice machine. Use your big head to allow you the use of your little head.

Remember, in the age of keycards someone who finds it will have no idea what room it unlocks.

Part B, and very important, is to explain to the provider what is going on. If you have colleagues on your floor, be sure to tell her that she can't use the key to enter your room (or knock) unless the hallway is empty. You might want to choose a lady who is described as intelligent by reviewers if you are seriously concerned about her ability to do this.

No problems were ever experienced.  In the scenario you are presenting, my suggestion would be to leave the hotel entirely if possible, meet her outside, and have her follow you up to your room in the elevator incognito.  Never had to do this myself, but once did at a lady's incall where she was paranoid to meet in the lobby.  We pre-arranged by texting when she came down on the elevator...when the door opened, I just stepped on, made the briefest of eye-contact, said nothing to each other in the elevator up.  When she got to her floor, I just followed her out, and behind her room at a discreet distance.  Once the door was closed and locked, it wasn't long before clothing went flying all over the room, and we were in bed together naked and happy.  Although this experience isn't reviewed because I had seen the lady numerous times already had previously done so .

I state this because you will need to think and be creative at times when hobbying.  Good luck!