You can keep track of all your house flips through the WORLD MAP! From there, you can see which cities you're currently renovating, any tasks ready for collection, and any new offers!

Also, you can use all your CONTRACTORS in each city! So, if you have 3 available and your furthest unlocked city is Phoenix, you'll be able to use 3 CONTRACTORS in Waco, 3 in Phoenix, and 3 in Kansas City (all at the same time!).