Advise needed urgently.

Dear brothers,
I need your advise plz.
Mera aik flat hai "d" type 900 sq ft ka third floor pe. G-11/3 housing foundation main. Kya aap mujhe is ki market value bata sakte hain. Sui gas installed nahin hai is main
Is ke ilawa mera aik plot hai 25x40 ka g-14/1 main. Mujhe 30 lac ki offer ayi hai apne dealer se. Kya ye offer reasonable hai?
Meri khwahish hai ke main ya ye flat ya phir g-14 wala plot baich ke apni investment e-12 main kar loon.
Kya mujhe e-12 main invest karna chahiye aur agar haan to plot bechoon g-14 ka ya phir flat. Kindly teenon ke expected prices bhi bata dijiye
25x40 plot in g-14/1
900 sq ft flat housing foundation in g-11/3 3rd floor
25x40 or 25x50 plot in e-12/3