Just as with the national housing market, builders can't keep up with rebuilding.

There are sometimes exceptions (eg major reno), but there is a process you have to go through.For things like reroofing, unless you are literally rebuilding the roof, the unit can be occupied while the new roofing material is put on.A quick google search showed this for Ontario "Landlords who evict tenants for repairs or renovations must allow the tenants an opportunity to move back in at the same rent before offering the unit to others, according to the proposed changes"Your best bet would be to not renew their lease (this is not the same as an eviction-an eviction is the result of the tenant not following the terms of the lease) when it comes up for renewal.

I also want to rebuild my credit and start investing in properties as soon as possible.

I am sure there are people waiting on rebuilds that will rent from you. 

Partnership funding to rebuild this house.

There's been quite a bit of cap ex as well as a recent $2,000 assessment per owner to begin a rebuild of the exterior steps at the complex.  

You will be taking off the entire second floor and rebuilding it all.

We are literally rebuilding half of the foundation.

Often, there's no capital gain tax on the sale of a residence anyway, so you never reap any tax benefit from rebuilding your own house.

Although I wonder from cost & work perspective, is that better/cheaper to do vs demolishing the existing shed and rebuild properly or replacing with a prefab unit (from Home Depot, etc.) after the demolition.