We have some 4 plex'es where I could add a 5th unit but have not do to the additional restrictions and cost of Elevators.

These restrictions shall run with the land are not personal to the Grantee."

and I'll catch @Steve Babiak  too (even though poor Steve is on the ignore list, lol) I'm aware of the superficial matters thought to be understood by investors concerning seller financing by "individuals", those "individuals" are homeowners, often restricted to those living in the subject property and the exemptions usually have other limitations to the number of transactions effected over a period of time, those exemptions vary from state to state in both the number of deals and periods of time.

In your written documentation, reference the section in your lease that restricts the number and type of pets.Train you tenant to respect the lease.Best to you.

It also provides an example in which it argues that it would be unfair to deny a couple of adults and their infant renting a one-bedroom apartment, but it would not be unfair to deny the same request from a family of two adults and a teenager.So, in your case, denying renting a one-bedroom apartment to a family of 4 would not violate fair housing laws provided your occupancy policy is to restrict the number of occupants to two.And I think this HUD publication really addressed the same issue you raise between the infant and the teenager. 

What are the maximum lot coverage restrictions of that zone?  

I would have bet activity would have decreased with D-F, not so, guess the overall economy and the swing back of the RE market more than compensated for the passing of the restrictions.

Short sales are EXTREMELY difficult to use with transactional funding because most lenders include clauses in their contracts to restrict flips.  

If you restrict yourself to only using the money you have in your pockets, then you have a limited supply of money, which not only prevents you from doing deals, but also gives you a slower growth rate in your business (how fast do you want to get out of your career?).  

With regard to your $50k income restriction, do not automatically assume that if household income is over $50k they will buy a home.