Afternoon Office Creepy Feelings

I'm a sceptic first, believer second.

Opinions are welcome however please keep them as opinions or ideas - I am open to all ideas however I hope that by anyone choosing to comment on this story that you respect me as well as my opinions and/or ideas.

Now to get to the important part which is to do more with the feeling I get rather than what I've heard or seen...

I work in a small office building 2mins away from the city (Will not say which state as to protect my identity) and have been working as the receptionist for about 6-8 months now; it is a lovely job and close to many fast food outlets, pubs/clubs, restaurants and other entertainment places to hang out and enjoy yourself.

Now in searching for any history to this building I've not been able to find much out, the only thing I have got from the history of the building that apparently it used to be a brothel many years ago - Those who do not know what a Brothel is and are over 18 please Google as it's a bit embarrassing to say...

Anyway part of my job includes collecting the mail and then opening the office and getting everything sorted for the day so I get in around 8.15am and I am alone until about 9 - 9.30am. For the hour that I'm alone I feel totally at ease and calm. However packing up at the end of the day is another story and even sometimes when I'm alone during the middle of the day it's a bit uneasy... Twice I've seen something move from the corner of my eye which has startled me, now this I've brushed off as my imagination or eyes playing tricks on me.

The first time I was in the kitchen waiting for the kettle to heat up and was staring out the window when to my right (The female toilets which is in a room directly to my right in the kitchen with the exit door between us and further back to my right the kitchen bench - to my left is the fridge and a sitting table for lunch time) I noticed something like a human crouched down or a big cat/dog-like creature dash behind the half open door to the toilet. My first instinct was to stand still but then I talked myself into thinking it was just my eyes so I quickly closed the door anyways and hurried back to my desk at the other end of the office building...

The second time was just earlier today when I was working at my desk - Now I probably should mention that there are two doors, one to my right which is constantly locked and blocked by my reception desk which is L shape with the short edge to my right and long edge in front of me making a little area for reception and the other door is also to my right but in front of my desk which is where people enter and exit from and is where a walkway/hallway starts. Behind me is an office blocked from me by a wall, the door is behind me on this wall but more to the left. And on the opposite side across the walkway/hallway from my reception area is another office exactly the same as the one behind me. Now this office door is normally open only a jar most of the time and I can see a bit inside.

So as I was explaining, I was working at my desk and from the corner of my eye I saw a tall grey thing disappear further into the office... It's a bit nerving however I'm going to stick with it either being my eyes (for example dust particles) or my imagination...

We had someone come out to fix the cracks and holes in the floorboards the other day in which he said were probably 150 years old so there could be a lot of history here...

I'm sure there could have possibly been something happen here and especially if it being a brothel was true then I would have no doubt that such a busy area with so many alcohol supplying places something bad could happen... And possibly there may be something in this building... But until I have solid proof then I will continue going about my time thinking this place is just old and that it's just my imagination:)

I hope all descriptions were easy to understand and I am sorry that it had nothing super creepy or nothing that was difficult to debunk but I know this feeling is odd and whether something is here or not or it is good or bad it's a feeling I get that makes me feel a bit scared and that I would love to get out of here ASAP!