Shah sb, considering the core criteria that you have mentioned:
10 Million + Best Possible Returns + 2-3 years time in ISB/RWP
I will add to what Nadeem sb and AQ sb have said
-- Different people see returns differently.
*A. Price appreciation of Plots
*B. Price appreciation of House (Plot price Increase + Profit in Constructed Unit)
*C. House Construction starting to get more and more expensive due to rising inflation, unstable PKR and increased taxation. Personally speaking, if I have amount I will try to construct today rather than tomorrow, otherwise margins get compromised.
*D Monthly Rental Returns (while appreciation of B as well)
-- In addition to DH/BT/CDA (good enough options) Bahria Enclave and Gulberg Residencia are also solid options. Enclave is not that lucrative for pure investment purposes but suits well if one want to have quality living while at holidays. It is still good if selling is targeted towards overseas clients.
-- If you wanna also utilise your property as a holiday home (that actually is the real joy and value of it) consider Enclave, Phase 8, DHA, Gulberg Residencia possession options.
-- Pure plot based investments in 10 Million bracket, I would go with
** 1 5-Marla in CDA I-series sectors (I-12, I-15, I-16) in
** 1 7-Marla Possession plot in Gulberg Residencia.
-- It depends on ones financial preferences to rent out one portion and reserve one for oneself. Finding a decent tenant can be a luck factor but if you have the tenancy that generates monthly income and eliminates the needs for a guard too!