Are you looking to reassign or to complete/have tenants?
If you decide you want to keep the condos long term and deal with tenants, then I would suggest having all your units in one building. It will give you more pull on Strata (and you should be able to be grandfathered in even if it turns into a low precentage rental building).....which is actually what you want if you are holding long term. Tenants are a pain in the ass, and I woud definately try to minimize the drama by having them all in one building.
If you are looking to buy and reassign, there isn't a lot of drama in holding properties in multiple buildings if hedging your bets makes you feel better. There may be a few hours of extra work entailed, but nothing substancial.
There still are some benefits to purchasing in the same building, even if you are looking to reassign them.
-Often you will get a slightly better price for buying multiple units in one building.
- Many real estate agents will also give you you a slightly better price for listing reassgingments in the same building.
- Most notibly, property developers keep preferred client lists. The more properties you puchase over time from one developer, the higher you rise on the list. This gives you first dibs on future developments (usually at a reduced rate) prior to the public being able to purchase in the development. In good buildings, the best suites are already snapped up before phase one sales become public.