I know that sounds vague but I was not given the details. 

The money I pay in rent for the extra time is offset as soon as I am in the quadplex for 16 months. 

(assuming because that's what that price would most likely get you) How much extra cash would you recommend having on hand AFTER buying the duplex?

I would also throw in Facebook, and spring the extra money for the promotion.

Here are some details about the two options.Option 1 - We would use our equity and some cash as a down payment. 

An expert like @Dave Foster could tell you if there’s anyway to pull it off if you have the extra 50% in cash laying around.

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The detailed nature of the estimator was surprising but helpful.

The colleges in NEPA are: Stroudsburg U, Kings Coll and Wilkes in Wilkes Barre, Keystone in Dalton (near Clarks Summit) and in Scranton there is Univ of Scranton, Marywood and a branch of Penn State.In regard to the Poconos there is an abundance of single family opportunities in the private communities but also HOA dues and extra due dilligence to understand each community.That is a tour of a small piece of PA.

Here are some considerations for each option:Option 1: Using the HELOC for a down payment and renovation on a second property to rent:Pros:You can leverage your existing property to acquire another investment property without selling your current home.Rental properties can provide a steady income stream and potential long-term appreciation.You can use the HELOC funds for renovation, which can increase the property value and rental income.Cons:You'll have to manage the property yourself or hire a property manager, which can be time-consuming and add to your expenses.There is a risk of vacancies or unexpected maintenance costs, which could impact your cash flow.You'll have to pay back the HELOC, which will increase your monthly expenses.Option 2: Building a new house in a new community and selling it for a profit:Pros:You can potentially make a significant profit if the market is favorable and the property value increases during the construction period.Building a new house allows you to customize the property and potentially attract more buyers or higher rents.Cons:This strategy involves a higher level of risk, as you're betting on the market to appreciate in a relatively short period.There are many unknowns and potential delays in the construction process, which could impact your timeline and profitability.You'll need to have a good understanding of the local real estate market and construction costs to ensure that your project is profitable.Before choosing either of these strategies, consider the following:Research the local market conditions in Chandler, Arizona, to understand the current demand for rental properties and new construction homes.Consult with a real estate agent or investment advisor who has experience in the local market to get their insights on the best strategy for your situation.Evaluate your financial situation, including your income, expenses, and risk tolerance, to determine if either strategy aligns with your goals and financial capacity.Consider the tax implications of each option, as this can impact your overall profitability.Create a detailed financial plan for each option, including projected income, expenses, and potential risks, to help you make an informed decision.Ultimately, the best strategy for you will depend on your unique situation and goals.