There are many concerns of a property buyer or atleast these should be his/her concern.
1. Age & Residual life of structure & exteriors.
2. Work to home distance & traffic
...etc list could be 50, 60 points checklist
If you go for specialised service, then your market base would be micro or elites or nische.
But if you have more services like MagicBricks.c , your mentioned services, legal services including drafting agreements & assignment or sale or lease deeds, registration, property valuation, etc, your co & website will be much more broad based and useful.