Good references are always a good starting point. Certainly a good texture will provide some of the missing visual interest, but without a specific building or at least style it's sort of hard to provide direction.
You don't have to over complicate things, a pretty much flat building is a pretty much flat building. blending between 2 or more textures is definitely the way to add detail and avoid obvious tiling.
You have to add more small details, like washlines, chairs, the railing on the roof, some open windows, some plants on the balcony, ...
This way it will look like people are actually living inside of it.
I suggest you change the ground floor so it isn't the exact same as the others. By this I mean remove the glass railing on the ground floor and make it more solid there or add a cover for a pathway.
as you can see the ground floor is different to the other floors
Looks ghetto? It's a city that's been abandoned by it's original inhabitants for 34 years. It's not going to look like a spring chicken, and that's before you ignore the fact that it was designed based on architectural sensibilities that were flurishing in a totalitarian, socialist state.
Seriously Sargentcrunch, if you're going to pull in a reference only to throw away everything that makes it unique and vibrant, why not just use a different building as your reference?
For someone with a thread title "Help me improve my apartment building!" your not being very receptive to criticism. I vote for the lobby as well, breaks up the silhouette, is visually more interesting, and helps to ground the building.
Hey sargent, you should listen to what everyone said here. Every piece of critique you've received would help this piece out a lot.
"12 // Learn How To Accept Feedback
One of the most important things for an aspiring artist to learn is learning how to accept feedback. The first time you receive some negative feedback it can be disheartened and it can take a strong personality to handle it well but it's important to realise that receiving feedback is a positive thing, even if it's not necessarily positive feedback. The reason for this being that if someone takes the time to give you feedback they obviously think you're worth the time investment and they want to see you reach your full potential."
I may sound like a bit of a dick but you seem to be brushing everyone aside who is taking their time to help you out.
Now, to try to help you out.
I see you said you don't want the building to look old; however, you want it to look lived in. You ignored vincentvangeel's advice earlier, where he said to add trees and pots. I think one issue you have is not looking at nearly enough reference images. If you don't want to look on the internet, you can walk around with a camera and take images of apartments you find interesting.
Here are some images of buildings that don't look "ghetto", but lived in. Look at exactly what makes each building look lived in, don't just look at the building as a whole. Look at the placement of air conditioners, clothing racks (with or without clothing), chairs, open windows, open doors (to balcony), small smudges on windows and the building, antennas (or cable dishes) on the roof, and even the color of the blinds. To compliment the addition of these props, think about how the building naturally wears. If it's in a super rainy or area with harsh conditions, there may be a bit of weathering starting at the roof (rain/snow runoff) and at the first floor (dirt, mud, traffic, etc).
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This way it will look like people are actually living inside of it.
as you can see the ground floor is different to the other floors
Seriously Sargentcrunch, if you're going to pull in a reference only to throw away everything that makes it unique and vibrant, why not just use a different building as your reference?
I may sound like a bit of a dick but you seem to be brushing everyone aside who is taking their time to help you out.
Now, to try to help you out.
I see you said you don't want the building to look old; however, you want it to look lived in. You ignored vincentvangeel's advice earlier, where he said to add trees and pots. I think one issue you have is not looking at nearly enough reference images. If you don't want to look on the internet, you can walk around with a camera and take images of apartments you find interesting.
Here are some images of buildings that don't look "ghetto", but lived in. Look at exactly what makes each building look lived in, don't just look at the building as a whole. Look at the placement of air conditioners, clothing racks (with or without clothing), chairs, open windows, open doors (to balcony), small smudges on windows and the building, antennas (or cable dishes) on the roof, and even the color of the blinds. To compliment the addition of these props, think about how the building naturally wears. If it's in a super rainy or area with harsh conditions, there may be a bit of weathering starting at the roof (rain/snow runoff) and at the first floor (dirt, mud, traffic, etc).