Serum phosphorus, calcium, magnesium and potassium >= lower limit of normal (LLN) Phosphorus >= LLN; NOTE: Supplementation may be given before the first dose of study medication Serum phosphorus >= lower limit of normal (LLN) Serum phosphorus >= 2.3 and < 4.8 mg/dL Serum phosphorus within normal institutional limits Phosphorus WNL Demonstrate adequate organ function as defined in protocol, AND normal (WNL of local lab range) serum correct calcium, and phosphorus levels. Phosphorus =< institutional upper limit of normal Within 7 days before the first dose of study treatment: Serum phosphorus, calcium, magnesium and potassium >= lower limit of normal (LLN) Serum calcium & phosphorus within normal institutional limits Use of medications that increase serum levels of phosphorus and/or calcium Inorganic phosphorus outside of normal limits Serum phosphorus >= lower limit of normal (LLN) Serum phosphorus >= lower limit of normal (LLN) Phosphorus < LLN Normal phosphorus (can be on oral supplementation) Phosphorus >= 2.3 mg/dL RENAL COHORT: Laboratory values as follows within 4 days before the first dose of daratumumab: serum phosphorus ? lower limit of normal (LLN) Phosphorus >= LLN =< 14 days prior to registration\r\n* NOTE: Supplementation may be given before the first dose of study medication Serum phosphorus, calcium, magnesium and potassium >= lower limit of normal (LLN) Serum phosphorus >= lower limit of normal Phosphorus above lower limit normal range for the institution; supplementation may be given before the first dose of study medication Serum phosphorus >= lower limit of normal (LLN) Serum phosphorus, calcium and potassium >= lower limit of normal (LLN) Obtained =< 7 days prior to registration: Phosphorus WNL Serum phosphorus >= LLN Serum phosphorus >= lower limit of normal (LLN) Serum phosphorus >= lower limits of normal (LLN) Serum phosphorus >= lower limit of normal (LLN) Serum potassium, magnesium and phosphorus >= lower limit of normal (LLN) and =< 1.2 x ULN Serum phosphorus, magnesium, calcium and potassium >= lower limit of normal (LLN) Serum phosphorus >= lower limit of normal (LLN) (if below LLN, for asymptomatic patients replacement may be initiated if clinically indicated without delaying the start of study treatment) Serum phosphorus >= LLN Serum phosphorus > 2.5; electrolyte repletion is allowed to reach these values Use of medications that increase serum levels of phosphorus and/or calcium Inorganic phosphorus outside of normal limits Sodium, potassium, and phosphorus levels no worse than grade 1 Serum phosphorus >= LLN Serum phosphorus calcium, magnesium and potassium >= lower limit of normal (LLN) Serum phosphorus, magnesium, and potassium >= lower limit of normal (LLN) after adequate supplementation if necessary Phosphorus >= institutional lower limit of normal (repletion allowed) Normal serum electrolytes, magnesium and phosphorus on the day of therapy; correction of abnormalities is permitted Calcium phosphorus product less than 4.0mmol2/L2. Inorganic phosphorus =< ULN Phosphorus less than 4.0 times below or above the upper or lower limit range