It depends on a LOT of factors. 

it depends.     

@David Brown Open escrow with an escrow company, title company, or attorney, depending on what's common practice in the state you're buying the property.

Keep in mind even tho they haven’t paid and Loney hasn’t changed hands YOU haven’t given them a late notice or notice to quit so technically since they most likely haven’t been informed in legal fashion, they might have some ground to stand on.

And the property to buy will depend on how much I can sell the 4 family. 

Anything secured against the property will be paid off (it may be a partial pay off depending on negotiations with your lender) but you will still have the responsibility to not only use all of the cash in the next purchase but also to purchase at least as much as you sell.So, if you've had to make a partial payoff to sell the property you'll either have to replace the debt or bring in cash from somewhere else to meet your 1031 requirements.

Just the design phase, drawings,engineering, permits, etc is going to be 10-20k depending on the scope.

The only problem was, that renewing cost was double and depending on your plan, they also charged me $100 for every service call.

However, if you are talking California almost anywhere in California this should prove to be a profitable strategy but it also depends, not in the middle of the desert for example or in depressed areas, war zones would also be obviously out as well.

Depends on the price and location.Market is hot doesn't mean it's hot to rent anything: after schools are in, very seldom people are moving.Here is the best time to rent anything: May through August After Labor Day it's quiet ps what means self Showing?