Investment advice - cda sectors

Hi all,

I have a budget of 40 million approx and want to invest this money into cda sectors. My primary target is small houses (4-8 marla) and apartments in zone 1 i.E. I-8, g-8/9 and f-10/11. For houses, from zameen.Com trends, i see that average rental yield is around 4.45%. It means i need to invest at least 1.35 crore to get 50000 monthly profit. For flats the yield is around 5%. My primary and secondary objects are steady monthly income and property price increase in 5 years.

Although, most of my money is in a us dollar account and i can see the unfortunate rupee devaluation going on these days! So, i am requesting guidance from the members into the following queries. I will be very grateful of the responses and may allah give you jazakhair for guiding me into the right direction.

1. What considerations i should have in mind while investing my hard earned money? Any other best ideas but not plot gambles?
2. Where is the rental yield best in whole islamabad?
3. Is it a good decision to invest in zone1 at this time? I dont want to invest in private housing schemes expect dha due to credibility issues.
4. Should i hold my investments for some time to see how the dollar-rupee battle goes?

Thanks in advance for your kind responses