Most counties have a chart that allows you to figure out these amounts.2) 20% for PM, Vacancy & MNT?

From my findings, the two subdivided lots would comply with the requirements provided by the county:The minimum lot size is 1 acreThe minimum lot width is 135 feetThe front building setback is 60 feetThe side building setback is 20 feet (for corner lots it is 30 feet on the street side)The rear building setback is 60 feet

You seem very green, I would highly suggest finding a property management company to do this for your while you learn the ropes and how things work.However, you can also get a copy of "The Book on Managing Rental Properties" by Brandon Turner, and get some really good information.The main one's to consider are:Background check - totally clear, or will you allow certain thingsEviction history - totally clear, or will you allow if no evictions for last xx yearsIncome Requirement - usually 3x the cost of rentCredit History - totally clear, or will you allow certain thingsPets - yes or no, size, type, number of pets allowed, extra pet deposit/feeAgain, I highly suggest a property manager to assist you with this.

I have a house that is a two bedroom one bath property with a decent size lot.

Hey @Graham Huber here's a couple charts on Philadelphia compared to other nearby major cities.

Hi Jamie, thank you.How do you target mid-size companies?

Lets talk :) What type of unit size are you looking for - small duplexes/triplexes or more of large unit multis?

The price of real estate there is off the charts and completely insane.

Typically a rule of thumb is with no experience and average credit you are looking at 15-20% down depending on the rehab size and complexity. 

See the chart from Fair Isaac Company (FICO) below: FICO Score Pct of Population Default Probability 800 or more 13.00% 1.00% 750-799 27.00% 1.00% 700-749 18.00% 4.40% 650-699 15.00% 8.90% 600-649 12.00% 15.80% 550-599 8.00% 22.50% 500-549 5.00% 28.40% Less than 499 2.00% 41.00% Source: Fair Isaac CompanyAccording to this chart, investors should use corresponding vacancy+tenant-nonperformance factors of approximately 5% for Class A rentals, 10% for Class B and 20% for Class C.To address Class C payment challenges, many industry "experts" are now selling programs to newbie investors about how Section 8 tenants are the cure.