Of course what he’s doing is creating a book of private “listings”, tying them up at a specific price for 90 days, and only closing if he can flip the contract for a higher price to an end buyer.

Figure out your investment style first and then you can ask more specific questions on different ways to achieve that goal.

@John Underwood are you using excel with specific formulas?

For recommendations on mortgage brokers or banks, feel free to send me a private message with any specific questions you have.

I ask tenants to email issues because it provides a record and forces them to provide specifics. 

I am based in Greater Philadelphia region and worked on a deal the owner sold 75K sq ft self storage and kept 20K sq ft of contractor specific self storage.

@Ayyoub Reza   There are a number of places to get agreements but make sure you get one that is current and state specific (here, legal zoom, a lawyer, real estate association ) Read your HOA bylaws what does it require to be included.

Every time I have bought a house for my own use, I have spent weeks browsing before finding the perfect home for me and within my budget.

Asking these questions directly to the specific parties involved would be a more efficient use of time.

Be specific about what you're doing there in case you have an issue.