Your effective gross after vacancy and collection loss will bring the multiplier up even higher.  

Something that every flipper and rehabber should be aware of when they first analyze their deal.In Chicago where I do business the deals are priced as a multiple of gross income (GIM = gross income multiplier) and to a lesser extent, cap rate.

Then multiply into the sq ft of the property you want to buy.

Check under the education tab and the Tools tab.Two terms you should be familiar with for Multi Family buildings are "Cap Rate" and "Gross rent multiplier".

The assessment is the value that the tax is applied to, in your case, multiply the mil rate by $9350. 

Given a GRM of 8.7 and a GOI on my subject of lets say 30k a month- fair market price of my subject is $261,000. (30,000*8.7=261,000)If the GRM was the same for the area your duplex deal is in then a fair market price is $168,084.Gross Rent Multiplier serves to indicate what the market is paying as a multiplier of the gross income.

Also consider that if you invest $10K and raise the rent by $100 you have not improved your gross rent multiplier at all.

Purchase Price: $159,900.00 Purchase Closing Costs: $2,000.00 Estimated Repairs: $5,000.00 Total Project Cost: $166,900.00 After Repair Value: $159,900.00 Down Payment: $31,980.00 Loan Amount: $127,920.00 Loan Points: $0.00 Loan Fees: Amortized Over: 30 years Loan Interest Rate: 5.000% Monthly P&I: $686.70 Total Cash NeededBy Borrower: $38,980.00 Monthly Income: $1,900.00 Monthly Expenses: $1,663.04 Monthly Cashflow: $236.96 Pro Forma Cap Rate: 6.64% NOI: $11,084.00 Total Cash Needed: $38,980.00 Cash on Cash ROI: 7.29% Purchase Cap Rate: 6.93% ExpensesIncome50% Rule Total operating expenses: $976.33 Mortgage expenses: $686.70 Vacancy: $133.00 Repairs: $190.00 Electricity: $75.00 Water: $125.00 Sewage: $210.00 Garbage: $75.00 Insurance: $60.00 P&I: $686.70 Property Taxes: $108.33 Financial Info Income-Expense Ratio (2% Rule): 1.14% Total Initial Equity: $31,980.00 Gross Rent Multiplier: 7.01 Debt Coverage Ratio: 1.35 Analysis Over Time Hide Assumptions Typical Cap Rate /year Expense Increase /year Income Increase /year Property Value Increase Year 1 Year 2 Year 3 Year 4 Year 10 Year 20 Year 30 Total Annual Income $22,800.00 $22,800.00 $22,800.00 $22,800.00 $22,800.00 $22,800.00 $22,800.00 Total Annual Expenses Operating Expenses Mortgage Payment $19,956.43 $11,716.00 $8,240.43 $19,956.43 $11,716.00 $8,240.43 $19,956.43 $11,716.00 $8,240.43 $19,956.43 $11,716.00 $8,240.43 $19,956.43 $11,716.00 $8,240.43 $19,956.43 $11,716.00 $8,240.43 $11,716.00 $11,716.00 — Total Annual Cashflow $2,843.57 $2,843.57 $2,843.57 $2,843.57 $2,843.57 $2,843.57 $11,084.00 Cash on Cash ROI 7.29% 7.29% 7.29% 7.29% 7.29% 7.29% 28.44% Property Value $159,900.00 $159,900.00 $159,900.00 $159,900.00 $159,900.00 $159,900.00 $159,900.00 Equity $33,867.29 $35,851.13 $37,936.47 $40,128.51 $55,847.23 $95,156.79 $159,900.00 Loan Balance $126,032.71 $124,048.87 $121,963.53 $119,771.49 $104,052.77 $64,743.21 — Income, Expenses and Cashflow IncomeExpensesCash FlowLoan Balance, Value and Equity EquityLoan PayoffProperty Value Edit Report Download PDF Report (Pro Only) Upload a company logo

I'm not going to bother with the numbers, only to point out that everything you posted about Buyer A is true for Buyer B but multiplied by a factor of however many units he/she has minus the incremental cost of the leverage.

In order to calculate the assessed value, multiply the market value by the appropriate assessment rate for the type of property.