From which university?
There is no difference. Some also call it B. Building Sc. or B Env. Sc. Some are equvalent to Part I, others are not accredited.

It is B. Arch (or, in some unis, they call it M. Arch now) that matters. You cannot be an architect with a BA or BSc, it's just an intermediate degree halfway through the B.Arch. course, which you can't do much with (half-baked architect if you like).

no, there's no UTM campus in east malaysia. just centers where people gather during the classes, that's all. if the east malaysian wanna fly over every weekend to semenanjung, then u can pay the UTM or Luar UTM fees . the extra cost is just to cover the costs of flying the lecturers over to you.

and yes, all UTM SPACE programme are taught by actual UTM lecturers in that particular field. we dont employ outsiders to teach for us. we have franchise programmes for that .

for architecture, i dont think they're offering in east malaysia yet.

the cost is the total for the entire bachelor degree.

i suggest u go refer to the 1st post first.

u cant take the part 2 exam if u dont have a part 2 equivalent degree.

architecture normally takes at least 5 years after STPM, or 6 years after SPM.

if u hold a diploma in architecture, u may get an exemption of 1 year off the part 1 degree.

UTM SPACE is being offered both in KL and skudai.

Your question is answered if you read page 1 of this thread - route to becoming an architect.

It seems there are a lot of students who enrol in the IPTS's without knowing what they are getting into, which is  really surprising.  For all the money the parents spend on their education, the students are not aware of their future.
The truth is that you are still a long way from becoming an architect after completing the B.Sc in Architecture in the IPTS like Taylor's or UCSI.  The IPTS would not highlight this to you for obvious reasons.

My advice is that going through the IPTS is not the recommended route.

I know a parent whose son finished his diploma at Taylors.  He went on to continue his studies in the UK.  He got his B.Sc after studying there for 2 years and he told his parent that he had finished his degree in Architecture and he would be doing his post-graduate degree( Masters) for another 2 years.  The fact is that, the 'M. Arch' that he will be getting is not even equivalent to LAM Part II since it is not accredited and he would need to take the LAM exams again upon returning to Malaysia in 2 years' time.

UTM SPACE only offers degree. the duration for that is about 7 years, depending on how many credits u take. and bear in mind UTM SPACE programme requires a diploma now. no SPM or STPM intakes anymore.
the reason for the procedures is simple: there are too many people applying. if that puts u off, then it is successful in turning away people who're not that interested in the course, hence making the number of applicants smaller and more manageable.

and UTM takes more polytechnic students than any other architecture schools. but yes, we tend only to take the top students. i mean, who wouldnt? .

anyways, it is absolutely YOUR CHOICE to make, be it IPTA or IPTS. but before u fall on one side or the other, make sure u make an informed decision!

call the head of department of urban planning  and/or landscape architect.

i'm not gonna give u any numbers. it's readily available on utm website. go do a little digging.